The most important thing is that it is not too late to go to bed, but it is recommended that you do not go to bed later than 23:00. From a Western medical point of view, the body secretes melatonin at 23:00, which helps you sleep. And from the Chinese medicine point of view, 23:00 belongs to the sub-hour, suitable for bed rest, and is conducive to liver metabolism, the body has certain benefits. 1, Western medicine: melatonin is a hormone secreted by the pineal gland of the brain, with an obvious circadian rhythm, sensitive to light, so the daytime secretion is inhibited, while the night is more active, about 23:00 after the secretion began to accelerate, so it is recommended to sleep early to promote the secretion of melatonin, for the endocrine The system has a certain protective effect. If you stay up late for a long time, resulting in insufficient secretion of melatonin, may cause a series of problems such as a decline in skin condition, irritability, hair loss, memory loss, especially for women, menstrual disorders, increased body hair and other symptoms, which is not conducive to the health of the body; 2, Chinese medicine: in Chinese medicine theory, the twelve meridians in the human body corresponds to the twelve hours of the day, the foot Shaoyang bile meridian corresponds to the son (23:00 to 1:00 a.m.), this is the time when the most yin energy. (1:00 am), this is the time when yin is at its peak, after which yin declines and yang grows, if you are in a sleep state, yin and yang meet, sleep can best nourish yin, sleep quality is also better, so it is appropriate to rest in silence. At the same time, Chinese medicine believes that sunset and rest, sunrise and work, the body needs to be in line with the circadian rhythm of nature, during this period if still awake, long-term, prone to appetite loss, no color, dry eyes and other symptoms, so it is recommended that sleep time is not later than 23:00. In addition, it is recommended to sleep for 8 hours a day, that is, from 23:00 to 7:00 in the morning, and for young people who are growing up, as well as for people who are physically weak, it is recommended to sleep for a relatively longer period of time, which is conducive to promoting physical growth and development and strengthening the body.