From a medical point of view, it is recommended to go to sleep before 11:00 p.m. at night, and going to sleep after 11:00 p.m. at night is considered staying up late. Sleep is very important for health, ensuring enough sleep helps maintain the health of the body’s various systems, and is conducive to maintaining a better state of mind. Clinical medicine believes that 11:00 at night to 1:00 in the morning the next day is the body’s self-repair time period. If the human body has not gone to sleep during this period, the body’s functions are still in operation, can not be restored, which will lead to the next day’s lack of concentration, poor mental state, affecting normal learning and work. Long-term staying up late can also aggravate the burden on the patient’s internal organs, easy to cause cardiovascular disease, liver disease and so on. Since it has become the norm for the contemporary youth population to stay up late for a long time, it is recommended that for the sake of one’s health, one should try to go to sleep before 11 o’clock at night, so as to avoid affecting the health of the skin and internal organs.