Occasionally stay up late once or twice a day is generally not very harmful to the body, but long-term stay up late easy to cause memory loss, vision loss, endocrine disorders and other hazards. 1. Memory loss: stay up late will lead to sleep deprivation, brain cells can not get enough rest, the next day there will be dizziness, lack of concentration and other phenomena, a long time can lead to memory loss and so on. 2. Vision loss: the use of electronic products during the late night, will lead to the eye caused by radiation and stimulation, long-term late-night use of electronic products, will lead to vision loss. 3. Endocrine disorders: staying up late is not a normal routine, often stay up late will affect all aspects of the body, including acne on the face, women’s menstrual disorders and so on. Staying up late will make people’s health affected, should develop good sleeping habits in daily life, to ensure that every day with enough sleep, if long-term late night caused by physical discomfort, should seek medical attention in a timely manner.