Staying up late for a long time will be harmful to your health. The sleep time of human body is different. Most people need seven to eight hours, and only a few people can sleep for four or five hours. The latest sleep should start from 1 1, and it is not advisable to stay up late. Staying up late will hurt the kidney, resulting in kidney deficiency losses, and it is easy to suffer from chronic diseases such as hypertension and diabetes.