Normal people sleep for 6-8 hours (old people and children 10 hours, babies are longer).

2.

The time for beauty sleep is from 22: 00 to 2: 00 in the morning.

3.

Staying up late for a long time, even if you sleep for 8 hours, it is easy to have endocrine disorders and physiological clock disorders in a few years.

4.

Children had better go to bed before 20:30 in the evening, because they have grown up.

5.

Teenagers should go to bed around 22 o'clock at night.

6.

As for those who love beauty, they must go to bed before 2 am, because the skin is metabolized before 2 am.

7.

Old people should sleep between 2 1 and 22: 00 at night.