Polyphasic sleep, a night mode that has not yet been the subject of many studies and knowledge on its long-term effects, is characterized by a reduced sleep time accompanied by naps at regular intervals. This approach of rest and sleep requires a very strong discipline, because the objective is to manage to divide its sleep in several times and to allow the brain to quickly reach the phases of deep and paradoxical sleep, which are the two most restorative sleep phases. Depending on the objective set, polyphasic sleep can lead to taking several naps in the same day at relatively precise times to allow the body and the brain to recover. One of the main objectives is to reduce the number of hours spent sleeping at night to two hours per night for example. Sleep is generally divided into cycles and the number of phases will depend on the time spent sleeping and the time spent awake. Among the different types of sleep, we find :

• Monophasic sleep which corresponds to a single sleep time Biphasic sleep which corresponds to a sleep divided into two times, a first long time corresponding to the night and a second shorter time during the day corresponding to the nap.Two-core sleep, for which the sleep time is divided into two sleep cycles ranging from four to one hour and three options including one, two or three naps the everyman sleep which consists in reducing the night time according to the number of naps taken during the day, this number being able to go from two for Everyman 2 to four naps for Everyman 4.the dymaxion sleep which corresponds to a sleep divided into four naps of thirty to thirty-five minutes over the twenty-four hours of a daythe uberman sleep which corresponds to a sleep divided into six naps of twenty to twenty-four minutes during a circadian cycle, that is to say a day