For a long time, the Internet is circulating a "Da Vinci sleep Act" method called sleep. This sleep law, who is also named in the multiple titles scientists, artists, inventors and other great figures - Leonardo da Vinci. According to legend, Leonardo da Vinci sleep 15-20 minutes every four hours, so about two hours sleep the day, a lot of time remaining in the creation, but also to keep plenty of energy. This sleep is actually a polyphasic sleep (Polyphasic Sleep), which means the integrity of sleep separated. Many superstitious this sleep method by which people want to shorten the overall time to sleep, while people's mental state, but can sleep nine hours of continuous single-phase sleep almost, you can have more time to work and study.
However, you will find by searching, in addition to describing the "Da Vinci sleep Law," the article, and no other reliable evidence that Leonardo DA Vinci in the long-term, regular use of such methods to sleep. But not without a halo effect wore master, indeed later people are willing to try this approach.
Few real experiments
Although many people claim that this polyphasic sleep method can greatly improve work efficiency, but not everyone is willing to defy the law to take its own. The only recorded history has long implemented a "Da Vinci Sleep" and "the first person to eat crabs," called Mister Buck • Fuller (Buckminster Fuller), is an engineer and designer. He published his own plan to sleep up to 2 years in 1943, "Time" magazine. During this time, he will nap every 6 hours 30 minutes, which means that sleep two hours a day. Finally, he had plans for his business partner tried to block terminated because of his work schedule and other people do not turn up. Although Fuller whether strict compliance with what he called a sleep plan, we do not know, but he is the first ever report on the successful implementation of a real person polyphasic sleep.
Recently striking polyphasic sleep experimenter has come famous blog author Steve • Paavo Leah (Steve Pavlina). He insisted polyphasic sleep more than two months, the cumulative sleep three hours a day, and to express their sleep logs on the blog. He admits that it is hard to adapt to the beginning, but after the second half of the experiment the body gradually adapts to this sleep cycle, can stay awake at night working condition. But by the time the end of the experiment, he tried to reduce the number of nap, let sleeping time becomes shorter, but often cannot hear the alarm clock and sleep six hours straight. Seems to want to keep a record of polyphasic sleep for a long time, not an easy thing.
Comments from the scientific community
Psychologists Wuzinaike (Piotr Woźniak) think polyphasic sleep is no scientific basis for the method, because our brain simply cannot adapt to the "multiple nap" sleep mode. Research on brain waves and other physiological indicators show that we are biphasic biorhythm rather than heterogeneous, which determines our body is always in favor of a single piece of sleep time. While trying to use a short nap time to reduce the amount of sleep practices, will make the different stages of sleep time reduction, disrupt biological rhythms, may eventually have a negative effect is similar to sleep deprivation and sleep rhythm disorders, such as physical and mental of hypothyroidism, anxiety and tension enhanced immune function. Wuzinaike polyphasic sleep by observing people involved in the blog found that most people have to go through some "maintenance activities", such as drink a lot of coffee and other ways to stay awake, and this polyphasic sleep on people's ability to learn and Creativity also did not show any improvement and promote.
sleep deprivation can only supplement
In some cases, people may not be guaranteed a full eight hours of sleep. At this time, there are regular short nap might make up the missing people sleep. Sleep research psychologist Claudio • Sitan Pi (Claudio Stampi) Dr. conducted a 49 days of the experiment, so that a young man nap 30 minutes every three hours a day of sleep time together almost three hours . He found this polyphasic sleep in the brain also has experience of ordinary sleep slow wave sleep and rapid eye movement sleep, but each stage of sleep time is shortened. In addition, Si Tanpi still "work and stress," published a field research journals, shows that under continuous work, can not achieve complete normal sleep state, periodic nap let people make up due to sleep deprivation brought awareness function decline. However, in his experiment, no matter how polyphasic sleep strategies also can not allow people to reach and sleep like a normal mental state and cognitive performance.
Thus, in his "Why We Nap: Evolution, Chronobiology, multiphase and ultrashort sleep function," a book summary, when sleep deprivation is inevitable, a short nap system can guarantee the best people to a certain extent state. But he does not advocate the polyphasic sleep as a way of life, because if you want to increase the work by polyphasic sleep time, quality and quantity of sleep is bound to be severely affected, long-term sleep deprivation will produce similar symptoms, it simply can not improve creativity.
Research from the military, perhaps more telling
Polyphasic sleep the way the military caused great attention because of wartime emergency situation much, if you can use polyphasic sleep to keep plenty of energy will be a good solution. According to the US military studies on overcoming fatigue, to take polyphasic sleep, everyone every nap time should be kept at least 45 minutes, more than two hours is better. In general, if a single nap time is shorter, then nap frequency should increase overall to ensure that every eight hours of sleep.
National Aeronautics and Space Administration is also studied for a nap, because the astronauts are often tense and can not be guaranteed due to 8 hours of adequate sleep. Professor of Pennsylvania School of Medicine conducted the study of sleep duration and Control "anchor sleep" is the basis for the 4-8 hours of sleep, and nap time ranging 0-2.5 hours. He found that a long nap more conducive to cognitive function play. The basic subjects alertness and performance on working memory tasks are due nap and improved. However, daytime nap beneficial to work, but such a slow state of bleary-eyed after a nap in the evening, if not normal sleep will cause sleep.
These studies have shown that in order to deal with special cases, reasonable arrangements for the time and manner of polyphasic sleep may be possible but in any case it is impossible to make total sleep time was reduced to just two hours.
Conclusion: rumor smash. Although the multi-phase type of sleep may seem in some people who can work, but because few people can really stick with it, so it is difficult to make conclusive scientific research. However, according to other studies on sleep, sleep experts suggest that you'd better sleep in prime time evening 10:00 to 7:00 in the morning 8-9 hours enough. If it is an emergency situation, perhaps you can try to get a nap in the way your body relaxed moment. However, this method can only be a supplement to the basic sleep, if it is as the main sleep mode, it is likely due to the interference of biological rhythms and have a negative effect. sources via supermemo, guokr, wikipedia, stevepavlina