Generally speaking, it is recommended to go to bed before 11:00 pm. Because the human biological clock is consistent with nature, from the natural law, the daytime is to wake people up, so that people work and live, the night to enter a good sleep, through sleep can restore physical strength and brain power, restore memory, so that the next day can be better awakening, better work and life, sleep time is not a certain rule, but 10-11 pm this time sleep will be better, sleep quality The quality of sleep will be better. Sleep goes through 4-5 sleep cycles a night, each sleep cycle has to go through different stages from light sleep to deep sleep, through 4-5 sleep cycles, the human brain will gradually recover, and some memories can be stored, and some harmful substances can be eliminated through sleep. If some people need to work at night or special work, their sleep time is not possible and normal people, if regular should also be possible, for example, some people work at night for a long time, can only sleep during the day, it is not impossible to develop a regular. The most fear is to often alternate, sometimes sleep during the day, sometimes sleep at night, frequent alternation is not conducive to the development of good sleep habits.