If you have not gone to bed at 11:00 pm, you are staying up late. The best time to rest and sleep for normal adults is 22-23pm at night and 6-7am in the morning of the 2nd day. Adults should sleep for 6-8 hours a day, with at least 4 hours of deep sleep and as little as 3 hours of light sleep. But people do not fall into deep sleep immediately after going to sleep, usually need to go through 3 hours of light sleep, and then enter deep sleep. Staying up late for a long time can bring a lot of harm to the body, which is not good for health, and can easily make the body fatigue and other subhealthy state, so be sure to avoid staying up late.