For the best sleep time, adults should sleep between 22-23 pm, because the best sleep time for adults is 6-8 hours per day, and the deep sleep phase should try to exceed 4 hours within this time, while the light sleep phase is less than 3 hours, the human body has to go through 3-4 hours to go from the light sleep phase to the deep sleep phase. For the deep sleep phase, according to the circadian biological clock and circadian rhythm of the human body, it is best to sleep deeply at around two o’clock in the morning, so go to sleep at around 22-23 o’clock at night, and after 3-4 hours of light sleep transition, you can enter the deep sleep phase at around two o’clock. Both to ensure the time of sleep, but also to ensure the quality of sleep, for maintaining the balance of the body’s basal metabolic rate, for the recovery of human energy and human health are beneficial.