Every day 2:00 to bed at 10:00 to get up, if you get up energetic, no physical discomfort, can not be counted as staying up late; if you get up and still feel tired and weak, poor mental health, it is not recommended to sleep too late, it is recommended to change the time of going to sleep. Staying up late has many bad effects on the human body, the most obvious is dark circles, dry skin, skin pigmentation, etc. In addition, it also includes the following hazards. 1. For young people in the growth period, staying up late for a long time may affect growth and development, resulting in slowing down or even suspending development, causing mental depression, lack of concentration, memory loss and so on. 2. Staying up late for a long time can lead to vision loss, visual fatigue, bilateral vision disparities, etc. 3. Staying up late is also one of the causes of hypertension, which may induce cardiovascular and cerebrovascular diseases.