In many cities, more than 70% of people go to bed after midnight. As long as you observe a little bit, you will find that most people are dozing off on the subway or bus in the morning, which shows that their bodies have not fully recovered before starting a new round of consumption. If things go on like this, the human body's energy will be overdrawn, immunity will decline, and various diseases will creep in. Therefore, everyone should try to ensure sleep time as much as possible to avoid leaving hidden dangers to health.