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which measure the prevailing conditions only, the data of this weather station is based environment and to place the device where the best conditions prevail. Try your So-called (dead-spots) which make reception impossible can appear everywhere. METEOTIME sends the data during precisely defined time slots in. To improve robustness of the communication system, gateways are designed to .. Requirements In this document, the words that are used to define the . been used, sometimes in combination, to flush out-of-date cache entries. .. For example, it MUST NOT be used as proof of a dead gateway (see Section ). Blink - first date Sleeping with sirens - better off dead The Way (Ariana Grande); Pour Some Sugar on Me (Def Leppard); Cherry Pie (Warrant); Guys My .
In other words, Bucky would catnap whenever he was tired and had an opportunity. However, if he could squeeze a sound 6 hours here and there, he would not miss the chance. This "dog sleep" did not fit any fixed alarm-clocked schedule. It was just a compromise between circadian rhythms and Bucky's hectic lifestyle.
Although even Stampi anecdotally refers to Leonardo da VinciLeonardo's polyphasic sleep is probably an urban myth. I could not locate any credible sources with any notes on his sleep habits, and yet da Vinci is nearly always mentioned whenever the art of napping comes into question.
It seems quite strange that someone would come up with a crazy polyphasic schedule idea at the time of leisurely Renaissance life that was well-timed by the superiority of sunlight over candlelight.
Allegedly, hinting at a monophasic mindset, he spoke of death: Leonardo would work continuously from dawn to dusk forgetting about food and drink. Stunned Bandello would definitely reported the round-the-clock work of a polyphasic sleeper as even more amazing. It seems to me that using a poorly researched historic case from years ago as a prop in favor of polyphasic sleep is rather a dated argumentum ad verecundiam.
Incidentally, da Vinci is also a name that crops up on other suspect lists: The same memetic mechanism must be placing da Vinci, Jesus, Einstein, and Hitler alongside each other in a number of myths over and over again.
Napoleon is not less frequently referred to in the context of napping or polyphasic sleep than da Vinci. And his case is rather easy to falsify through historical records. When compared with an artistic genius of Leonardo, it seems even more preposterous than a brilliant military commander could possibly retire for a nap during a prolonged battle or during his intense life peppered with plethora of engagements.
He is indeed said to have slept little and frequently suffer from insomnia at times of great stress. He was also often interrupted by messengers that might perhaps increase his propensity to napping at daylight.
Yet he was to be woken up only with bad news. The hard rule was that the good news could wait. His memoirs indicate that he did not mind dying young. Consequently, he would disregard his doctors on the matter of sleeping little and drinking buckets of strong coffee.
As Napoleon's life was jam-packed with stress, his short sleep might have been a consequence of his lifestyle. Low sleep diet did not translate well to Napoleon's military skills. Some contemporaries attribute his errors at Waterloo to sleep deprivation. Yet, during slower days he would sleep for sound seven hours, waking up at 7 and often lazing until 8.
Then he would yet add an nap in the afternoon. Records also indicate that at Saint Helena he was a normal sleeper, and while stress was replaced with boredom, he often slept late. Jefferson and Franklin seem easy to falsify as polyphasic sleepers. We can conclude that his sleep was not very regular, he would go to sleep at different times often late into the nighthe would always devote at least 30 min.
In other words, expectedly, there are no traces of polyphasic sleeping in Jefferson's life. As for Benjamin Franklinwe might conclude that he did not hold sleep in high esteem. This we can conclude from the famous quotations such as "There will be sleeping enough in the grave" or "The sleeping fox catches no poultry".
This attitude resembles the one of those who are ready to practise polyphasic sleeping today. It is also a frequent characteristic of high achievers from the times when we knew little of the biological function of sleep. Yet Franklin is even better known for saying: From this we might conclude that if he wanted to sleep less, his formula would be to get up early.
Not to shred sleep into pieces. Moreover, for a high achiever with little regard for sleep, retiring for a nap might feel like a major sign of laziness or weakness. That stigma lasts until today in western culture, where napping is often considered a habit of lazybones.
Last but not least, Franklin as a advocate of DST would say: Polyphasic sleeper definitely he was not. We know quite a lot about Winston Churchill 's sleeping habits.
Churchill could work his ministers to exhaustion by staying up late, but he would also routinely take a solid hour nap in the afternoon. As such, he was a classical biphasic sleeper. At his house at Chartwell, his routine was quite regular. He would wake at 8, spend the morning in bed reading papers, dictating letters, etc.
He averaged hours of sleep per day. Those words are attributed to Churchill himself: Take off your clothes and get into bed. That's what I always do. Don't think you will be doing less work because you sleep during the day. That's a foolish notion held by people who have no imaginations. You will be able to accomplish more. You get two days in one -- well, at least one and a half" source.
Churchill's well-drilled biphasic habits made him one of the most energetic wartime leaders. On a humorous note, F. Roosevelt's aides noted that after a Churchill's visit, the US president was so exhausted that he needed 10 hours of sleep for 3 days straight to recover.
Thomas Alva Edison had a love-hate relationship with sleep. Sleep researchers blame him for robbing the modern population of hours of sleep. Workaholics like to quote him on his contempt for sleep. Advocates of polyphasic sleep claim he was a polyphasic sleeper. Indeed, Edison's contempt for sleep is well documented. Yet it can only be attributed to his ignorance. Little was known about the biological role of sleep at his time. He believed wrongly that, as with food, humans will always sleep more than necessary given a opportunity.
As a natural short sleeper, he believed long sleep is a sign of laziness: That extra percent makes them unhealthy and inefficient. The person who sleeps eight or ten hours a night is never fully asleep and never fully awake - they have only different degrees of doze through the twenty-four hours". In a parallel flash of ignorance, Edison could not see much value in physical exercise.
His winter home featured one of the first modern swimming pools, yet Edison never used it. His co-workers noted that Edison actually slept far more than he would like to admit.
Clearly, he would carry sleeping little as a badge of honor.
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He catnapped a lot, and his nap cots have been preserved to this day in Edison museums. By no means could I though find any credible evidence that Edison's napping complied to any regiment other than "nap when sleepy", which usually turns out to match a biphasic pattern. The most reliable information I could find about Edison's sleep was his own diary kept only for a short time while approaching the age of forty.
From this diary we can learn a lot about his sleeping habits. He seemed rather obsessed with getting a good night sleep as his day would often start with notes on the quality of sleep. The better he slept the happier he seemed. That's quite the opposite of what polyphasic proponents claim.
Instead of maximizing waking hours, Edison would rather maximize the hours in which he could use his well refreshed mind. And that's exactly what seems most rational from the point of view of physiology of sleep, mental hygiene, and productivity.
After a short stint under Edison's umbrella, Nikola Tesla became a bitter rival of his former mentor. We have all heard of the "war of the currents", but Edison and Tesla clashed in another battlefield. They tried to outbid each other in sleeping little. Tesla noted that Edison slept much more than he would want others to believe.
That injects a dose of boastful personality to their own reports on how much the great inventors slept. Tesla who could indeed work throughout the night, would often crash for the entire day of sleep after his exploits. He exhibited classic signs of manic creativity, which might have been interrupted by short recuperative naps or long recovery sleep. Otherwise, Tesla was nothing more than a short sleeper. He was too busy with his pursuits to ever think of anything resembling a strict polyphasic schedule.
That would be a strait jacket on his flamboyant personality. All in all, the whole list of polyphasic geniuses seems to be lacking any credible evidence. As such it is probably a child of collective wishful thinking committed by those who would love to add waking hours to their day. Polyphasic sleep for dummies Some of the biological argument presented in this article may not be entirely suitable and convincing for teenagers, esp. Let's then reword it all in baby language. Experience shows that "for dummies" sections are most popular and most effective in conveying the message.
During the day, while learning and experiencing new things, you store your new data in RAM memory. During the night, while first in NREM, you write the data down to the hard disk.
Overnight, you repeat the write-and-defragment cycle until all RAM data is neatly written to the disk for long-term useand your RAM is clear and ready for a new day of learning. At waking up, you reboot the computer. If you reboot early with the use of an alarm clock, you often leave your disk fragmented.
Your data access is slow, and your thinking is confused. Even worse, some of the data may not even get written to the disk. It is as if you have never stored it in RAM in the first place.
In conclusion, if you use an alarm clock, you endanger your data. If you do not care about your intellectual performance, you may want to know that there are many biological reasons for which using alarm clocks is basically unhealthy. Those run beyond the scope of this article. Many people use alarm clocks and live. Yet this is not much different from smoking, abusing drugs, or indulging in fat-dripping pork.
You may abuse your brain with alcohol for years, and still become president. Many of mankind's achievements required interrupted sleep. Many inventions were produced by sleepy brains. But nothing is able to change the future as much as a brain refreshed with a healthy dose of restful sleep. You cannot sleep polyphasically without an alarm clock Your whole sleep cycle can be explained with the clock and hourglass model. Deep in your brain, your body clock is running on a 24 hours cycle.
Every 24 hours, the clock releases a sleepy potion that puts you to sleep. If you try to sleep at wrong hours, without the sleepy potion, you may find it very hard to fall asleep. All insomniacs suffers from the lack of sleepy potion. If they go to sleep too early, before they get their fix of sleepy potion, they will toss and turn. You need to listen to your body clock to know when it is the right moment to go to sleep.
Yet the sleepy potion produced by the body clock is not enough to put you to sleep. The brain also uses the hourglass of mental energy that gives you some time every day that you can devote to intellectual work. When you wake up, the hourglass is full and starts being emptied.
With every waking moment, with everything your brain absorbs, with every mental effort, the hourglass is less and less full.
Only when the hourglass of mental energy is empty, will you able to quickly fall asleep. To get a good night sleep, you need to combine two factors: If, on the other hand, you try to sleep without the sleepy potion while the hourglass of power is empty, you may succeed, but you will wake up very fast with your hourglass full again. That will make sleeping again nearly impossible. Insomniacs go to sleep before the body clock releases the sleepy potion.
When you wake up early with an alarm clock, you can hardly get to your feet because your body is full of sleepy potion, which begs you to go back to sleep. When you are drowsy in the afternoon, your hourglass of mental power might be almost empty. A quick nap will then help you fill it up again and be very productive in the evening. If you drink coffee in the morning, it helps you charge the hourglass and add some extra mental energy.
But coffee combined with the sleepy potion produce a poisonous mix that engulfs your brain in sickly miasma. If you try to drink coffee to stay up in the night, you will feel like a horse kicked you in the stomach. That's the acme of a criminal attack on your brain's health.
Here is why polyphasic sleep will never work naturally: Trying to take a nap at that time is a waste of time. You will waste time for nap preparations. You will waste time trying to fall asleep in the afternoon, if you hourglass is getting empty, you may be able to take a nap.
Your nap will be short because the sleepy potion is not there in the evening, your sleepy potion is still not there. If you took an afternoon nap, your hourglass is almost full of energy. If you try to take another nap, you will be staring at the ceiling. You will waste your time again in the night, your sleepy potion is released. Napping should be easy, but if you fall asleep, you will not wake up.
You will need an alarm clock. You may manage to recharge your hourglass fast, but the sleepy potion will make you groggy and tired. You may need a double alarm or a loud alarm, or some help from your Mom if she ever agreed to this polyphasic insanity.
You will fight and struggle. You will never wake up naturally. Not while the sleepy potion is in action If you decide to sleep polyphasically. You will have to use an alarm clock. Otherwise you will not wake up in the night. Once you use the alarm clock, you will be sleep deprived.
That will make your hourglass conveniently drained of energy. Empty hourglass will make napping easier indeed. But it is the hourglass that determines your mental powers. With the hourglass empty, you will be nothing more than an empty-headed zombie. To generate naps at equal intervals, you would have to kill the h circadian component of sleepiness. You would have to kill your body clock, and prevent the release of the sleepy potion.
That is not possible. The sleepy potion will be released every 24 hour and make you sleepy; however, much you fight it.
The shortest natural night sleep rarely goes beneath 3 hours. Many biphasic sleepers can do well on 4 hours. Yet most adolescents may need 7 or 8 hours of night sleep to function optimally. In healthy sleep, daytime naps are either impossible or very short. If you track your sleep with SleepChart freewareyou will see it on your own. You will see how naps tend to cluster at night time which may be midday for you. That's exactly what polyphasic guru Dr Stampi observed with solo sailors.
Remember, that for the picture to be true, you should avoid alarm clock, which naturally, is not possible in polyphasic sleep. Yet even on a forced schedule you will see regular patterns of naps being longer and more frequent at nighttime each time your relax your discipline, oversleep, etc.
The daytime naps will be shorter, esp. Body clock training has its limits I hear it again and again that all biological reasoning is of no consequence because the body can always adapt to training and pressure, and that science has not yet studied successful polyphasic sleepers. Polyphasic sleep would require shortening the body clock period six-fold! Drugs can reduce the impact of sleepy potion, but this should be avoided, as this affects the sleep stage cycles i.
Entrained free-running polyphasic sleep is not possible in healthy individuals Summary Healthy body clock runs a 24 hour cycle. This cycle will make you sleepy during the subjective night which can be midday too. This is why you won't be able to wake up from your nap in your subjective night without an alarm clock.
Alarm clocks are unhealthy. They prevent sleep from fulfilling its function. The choice is yours: If someone tells you he is doing naps every four hours, and that the naps last 20 min. That will bring it home. For example, narcoleptics fall asleep many times during a day. But that is a result of a damage to their sleep control system. It is a disease and it badly affects their productivity and their life.
Narcoleptics are always sleepy. Comic relief One of the theories of the biological basis of humor says that it is generated by the sense of superiority over other individuals.
Allegedly, those who are able to detect the ignorance of fellow human beings, reinforce their findings through the sense of joy and well-being. Thus seeing others doing stupid things is fun as long as, hopefully, nobody gets hurt on the way. Supposedly, the evolutionary mechanism of poking fun at the silly ones helped humans preserve wisdom through generations long before written records were available.
In that context, if you understand the sleep control mechanisms that imply the impossibility of entrainment to polyphasic schedule, you may find studying the blogs of polyphasic sleepers extremely funny. With clues and red flags all over the place, the bloggers keep hitting the brick wall.
Luckily, those individuals usually see the light after a few weeks of pain. We should hope that nobody gets hurt in the process, e. All blogs seem to roughly evolve through similar stages. There is a cultish aura around the whole concept. This monastic appeal is accentuated by the fact that the ambitious adopters often run various forms of diets as part of their "reform".
There are lots of hopes associated with the "polyphasic experiment". Those usually revolve around being able to do more, and experiencing "increased energy". The hopes are magnified by the fact that many volunteers find it difficult to get refreshing sleep in the first place.
Segment A segment is the unit of end-to-end transmission in the TCP protocol. A segment consists of a TCP header followed by application data. A segment is transmitted by encapsulation inside an IP datagram.
Message In this description of the lower-layer protocols, a message is the unit of transmission in a transport layer protocol. In particular, a TCP segment is a message. A message consists of a transport protocol header followed by application protocol data. An IP datagram consists of an IP header followed by transport layer data, i. In the description of the internet layer Section 3the unqualified term "datagram" should be understood to refer to an IP datagram. Packet A packet is the unit of data passed across the interface between the internet layer and the link layer.
It includes an IP header and data. A packet may be a complete IP datagram or a fragment of an IP datagram. Frame A frame is the unit of transmission in a link layer protocol, and consists of a link-layer header followed by a packet. Connected Network A network to which a host is interfaced is often known as the "local network" or the "subnetwork" relative to that host. However, these terms can cause confusion, and therefore we use the term "connected network" in this document.
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Multihomed A host is said to be multihomed if it has multiple IP addresses. For a discussion of multihoming, see Section 3. Physical network interface This is a physical interface to a connected network and has a possibly unique link-layer address. Multiple physical network interfaces on a single host may share the same link-layer address, but the address must be unique for different hosts on the same physical network. Logical [network] interface We define a logical [network] interface to be a logical path, distinguished by a unique IP address, to a connected network.
Path At a given moment, all the IP datagrams from a particular source host to a particular destination host will typically traverse the same sequence of gateways.
We use the term "path" for this sequence. Note that a path is uni-directional; it is not unusual to have different paths in the two directions between a given host pair.
MTU The maximum transmission unit, i. The terms frame, packet, datagram, message, and segment are illustrated by the following schematic diagrams: Transmission on connected network: Before IP fragmentation or after IP reassembly: The Editor would especially like to acknowledge the tireless dedication of the following people, who attended many long meetings and generated 3 million bytes of electronic mail over the past 18 months in pursuit of this document: In addition, the following people made major contributions to the effort: The following also made significant contributions to particular areas: We are grateful to all, including any contributors who may have been inadvertently omitted from this list.
If the system does not dynamically negotiate use of the trailer protocol on a per-destination basis, the default configuration MUST disable the protocol. The trailer protocol is a link-layer encapsulation technique that rearranges the data contents of packets sent on the physical network. In some cases, trailers improve the throughput of higher layer protocols by reducing the amount of data copying within the operating system. Higher layer protocols are unaware of trailer use, but both the sending and receiving host MUST understand the protocol if it is used.
Improper use of trailers can result in very confusing symptoms. Only packets with specific size attributes are encapsulated using trailers, and typically only a small fraction of the packets being exchanged have these attributes. Thus, if a system using trailers exchanges packets with a system that does not, some packets disappear into a black hole while others are delivered successfully. If a host configured to use trailers receives a trailer ARP reply message from a remote machine, it can add that machine to the list of machines that understand trailers, e.
In this way, either the requesting or responding host in an IP ARP exchange may request that it receive trailer encapsulations. This scheme, using extra trailer ARP reply packets rather than sending an ARP request for the trailer protocol type, was designed to avoid a continuous exchange of ARP packets with a misbehaving host that, contrary to any specification or common sense, responded to an ARP reply for trailers with another ARP reply for IP.
The prevalence of proxy ARP see Section 2. Even in the absence of proxy ARP, a long- period cache timeout is useful in order to automatically correct any bad ARP data that might have been cached. Four mechanisms have been used, sometimes in combination, to flush out-of-date cache entries. Note that this timeout should be restarted when the cache entry is "refreshed" by observing the source fields, regardless of target address, of an ARP broadcast from the system in question.
For proxy ARP situations, the timeout needs to be on the order of a minute. Again, the timeout should be on the order of a minute, and typically N is 2. The effect of this call would be to invalidate the corresponding cache entry. Approaches 1 and 2 involve ARP cache timeouts on the order of a minute or less. In the absence of proxy ARP, a timeout this short could create noticeable overhead traffic on a very large Ethernet.
Therefore, it may be necessary to configure a host to lengthen the ARP cache timeout. Failure to follow this recommendation causes the first packet of every exchange to be lost. Although higher- layer protocols can generally cope with packet loss by retransmission, packet loss does impact performance. For example, loss of a TCP open request causes the initial round-trip time estimate to be inflated. RFC elaborates and replaces the discussion in Section 3.
Every Internet host connected to a 10Mbps Ethernet cable: The MTU for an Ethernet is and for A receiver can distinguish Ethernet and In particular, the Another compatibility problem arises with link-layer broadcasts. A broadcast sent with one framing will not be seen by hosts that can receive only the other framing. The provisions of this section were designed to provide direct interoperation between capable and capable systems on the same cable, to the maximum extent possible.
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It is intended to support the present situation where only systems predominate, while providing an easy transition to a possible future in which capable systems become common.
Note that only systems cannot interoperate directly with only systems. If the two system types are set up as two different logical networks on the same cable, they can communicate only through an IP gateway. Furthermore, it is not useful or even possible for a dual-format host to discover automatically which format to send, because of the problem of link-layer broadcasts. The protocol standards used in the Internet layer are: The target of an IP multicast may be an arbitrary group of Internet hosts.
IP multicasting is designed as a natural extension of the link-layer multicasting facilities of some networks, and it provides a standard means for local access to such link-layer multicasting facilities.
Other important references are listed in Section 5 of this document. The host IP layer has two basic functions: The IP layer may also 3 implement intentional fragmentation of outgoing datagrams. Finally, the IP layer must 4 provide diagnostic and error functionality. We expect that IP layer functions may increase somewhat in the future, as further Internet control and management facilities are developed.
For incoming datagrams, the IP layer: For outgoing datagrams, the IP layer: A host is said to be multihomed if it has multiple IP addresses. Multihoming introduces considerable confusion and complexity into the protocol suite, and it is an area in which the Internet architecture falls seriously short of solving all problems.
There are two distinct problem areas in multihoming: A host MAY support local multihoming, which is discussed in this document, and in particular in Section 3.
In this mode, a datagram arriving through one interface will not be forwarded to another host or gateway unless it is source-routedregardless of whether the host is single- homed or multihomed. She realized that something tremendous and awe-inspiring had happened to her husband, and she was certain, knowing him as she did, that he was neither mad nor possessed. Allah would never humiliate you, for you are good to your relatives, you are true to your word, you help those who are in need, you support the weak, you feed the guest and you answer the call of those who are in distress.
Waraqa had studied the books of both the Jews and the Christians very closely and he had learned a great deal from many of their wisest people. He knew that the coming of another Prophet had been foretold by both Moses and Jesus, peace be on them, anhe knew many of the signs that would confirm the identity of this Prophet when he appeared. After listening closely to his story, Waraqa, who was both old and blind, exclaimed, "This is the same being who brought the revelations of Allah to Moses.
I wish I was young and could be alive whyour people will drive you out. Let me just feel your back. This was yet another of the many signs that Waraqa already knew would indicate the identity of the next Prophet after Jesus, peace and blessings of Allah be upon him. Not long after this incident, Muhammad was commanded in a subsequent revelation from Allah, through the angel Jibril, to call people to worship Allah only, and it was at this point that Khadijah did not hesitate in expressing in public what she had now known for certain in secret for some time: All her wealth was spent in the way of Allah, helping to spread the message of her husband, helping to free slaves who had embraced Islam, and helping to feed and shelter the community of Muslims that slowly but surely began to grow in numbers and strength.
The Quraish were infuriated by the Prophet's success and did everything in their power to discourage both him and his followers, often inflicting awful tortures on them, but without success. The situation became so bad that the Prophet told some of his followers to go to Abyssinia, where their ruler, the Negus, who was a sincere Christian gave them shelter and protection.
Eventually there came a time when, as Waraqa had foretold, Muhammad and his followers -along with all the members of his tribe, the Banu Hashim were driven out of the city of Mecca and forced to camp out in a small ravine in the mountains nearby.
This happened long after Waraqa had died, and about seven years after that extraordinary night of power in which Muhammad peace and blessings of Allah be upon him had received the first revelation of Quran through the angel Jibril.
There, while their homes lay empty in Mecca, the Muslims were exposed to the bitterly cold nights of winter and the fiery hot days of summer, with very little food and shelter.
No one would buy and sell with the Muslims, or allow their sons and daughters to marry any of them. Fortunately those who secretly sympathized with the Muslims would send what food they could to them whenever the chance arose, sometimes by loading provisions onto a camel or a horse and then sending it off at a gallop in the direction of the camp, hoping that the animal would not stop or get lost before it reached its intended destination.
For three years the small Muslim community lived a life of hardship and deprivation, but although they suffered from hunger and thirst, and from exposure to heat and cold, this was a time in which the hearts of the first Muslims were both purified and also filled with the light of knowledge and wisdom.
The Muslims knew that they were following the truth, and so nothing else mattered. They did not care what the Quraish did to them or said about them.
Allah and His Messenger were enough for them! It was during this period that the Muslims who had sought shelter in Abyssinia returned, only to find the situation even worse than when they had left it. Not long after, many of them returned to Abyssinia, their numbers swelled by those whom the Prophet peace and blessings of Allah be upon him had told to accompany them.
Finally the boycott was lifted and the Muslims were allowed to re enter the city; but the three years of hardship had taken their toll. First of all the Prophet's uncle, Abu Talib, who was by then more than eighty years old, died; and then a few months later, during the month of Ramadan, Khadijah also died, at the age of sixty-five, may Allah be pleased with her.
The Prophet Muhammad peace and blessings of Allah be upon him mourned her deeply. They had shared twenty-five years of marriage together and she had given birth to five of his children. Only one of the Prophet's future wives, Maria the Copt, would give him another child, Ibrahim, and he, like Qasim, was destined to die when he was still very young, at the age of eighteen months.
Khadijah had been the first to publicly accept Muhammad peace and blessings of Allah be upon him as the Messenger of Allah, and she had never stopped doing all she could to help him. Love and mercy had grown between them, increasing in quality and depth as the years passed by, and not even death could take this love away.
The Prophet Muhammad peace and blessings of Allah be upon him never stopped loving Khadijah, and although he married several more wives in later years and loved them all, it is clear that Khadijah always had a special place in his heart.
Indeed whenever 'Aisha, his third wife, heard the Prophet speak of Khadijah, or saw him sending food to Khadijah's old friends and relatives, she could not help feeling jealous of her, because of the love that the Prophet still had for her.
Once Aisha asked him if Khadijah had been the only woman worthy of his love. The Prophet peace and blessings of Allah be upon him replied: When she comes to you, give her greetings of peace from her Lord and from me, and give her the good news of a palace of jewels in the Garden, where there will be neither any noise nor any tiredness. Indeed the Prophet, who was now fifty years old, name this year 'the Year of Sorrow. Even when he journeyed to Ta'if, a small city up in the mountains outside Mecca, to call its people to worship Allah, he was rejected and stoned by them.
It has been related by Aisha that on his way back to Mecca, Jibril appeared to the Prophet peace and blessings of Allah be upon him and said, "Allah, may He be exalted and glorified, has heard what the people have said to you and how they have responded to your invitation, and he has sent the angel in charge of the mountains so that you can tell him what you want him to with them. I am the angel in charge of the mountains, and your Lord has sent me so that you can order me to do whatever you want.
If you wish, I can bring the mountain of the outskirts of Mecca together so that they are crushed between them. In the name of Allah, the Merciful, the Compassionate By the morning hours, and by the night when it is stillest, Your Lord has not forsake you nor does He hate you, And truly what comes after will be better for you than what has come before, And truly your Lord will give to you so that you will be content.
Did he not find you an orphan and protect you? Did he not find you wandering and guide you? Did he not find you destitute and enrich you? So do not oppress the orphan, And do not drive the beggar away, And speak about the blessings of Your Lord.
After three years of constant struggle, a relative of his, called Khawla, went to him and pointed out that his house was sadly neglected and that his daughters needed a mother to look after them.