Recently, the problem of chronic lack of sleep has affected many. Lack of sleep leads to many factors: fatigue at work, schooling, the birth of a child and many other factors. The mothers of young children, students and just constantly busy people know firsthand about the "chronic lack of sleep. "The face is constantly "dented", thoughts somewhere else, a cast-iron head. This state does not contribute to productivity in any way. Because of total lack of sleep, a person literally in 3 days acquires the face of an antisocial zombie. But if the constant workload just does not give you the opportunity to sleep 8-9 hours, how can a normal person do what? You need to look for a way to sleep in a much shorter period of time. Many processes in our body are guided by the brain, including sleep. Since the dream has a periodicity, it is fair to assume that it is based on a certain cycle, namely the light cycle "day-night". Two nights without sleep make the mind one-sided, and we can not adequately think. There are such violations as cardiac arrhythmia, arterial hypertension, diabetes, memory loss, obesity, depression and many other troubles. Somnologists( specialists who study sleep and know a lot about it) say that today there are no new methods for shortening the duration of sleep without harm to health. For life, the recovery of man's strength is enough for 5.5 hours of stay in the kingdom of Morpheus. However, this does not mean that a person will feel cheerful and asleep. And all because of the fact that the dream has several phases. There is a fast and sleepy dream. During the fast sleep phase, our brain processes the information accumulated during the day. But the phase of slow sleep is useful for the body: the brain processes information about "malfunctions" in the body. During a slow sleep, the energy of the body is restored, the cells grow and recover. For those who want to reduce the time spent in sleep, the most important task is to calculate the time for effective sleep. This is a very difficult matter. For a correct calculation it is necessary to carry out a kind of experiment. To start, select a couple of days off, when you can let the body stay awake for more than a day. Start the experiment at 00:00.From now on, listen to the body and your own sensations. Understand when your body wants to sleep, you can easily. You will begin to fall asleep. For further analysis, all changes with your body should be recorded. Write down the time when you want to sleep, assess the strength of a fit of sleep on a 3-point scale, record the duration of such an attack. All this should be continued until 00:00 the next day. The next day, after a good sleep, determine the two most severe attacks of sleep. For example, the first phase of an attack from 5 to 6 am, the second from 16 to 17 days. In this case, the ideal sleep schedule looks like this: from 5 to 7 am, and from 16 to 17 pm. And it is also worth considering that the moment when your sleep will be effective, you can also miss. Therefore, two hours before the "your" time of sleep, do not drink coffee and no Internet! So, now you know that there are different phases of sleep, through which our body passes during a period in the kingdom of Morpheus. An experiment is also described that allows you to determine your own effective sleep time. So sleep a little and with health benefits. Have a nice sleep!