Children of different ages enter sleep at night at different times, such as infants are recommended to go to sleep around 7-8 pm, while for older children, it is usually recommended to go to sleep around 8-9 pm. Sleep has the role of restoring energy and relieving fatigue, and is an important guarantee for the physical and mental health of the human body. Infants need 12-20 hours of sleep a day, so they should try to go to sleep at night at a fixed time around 7:00 pm. Since children have a growth hormone secretion peak at night, especially after 10:00 pm, growth hormone secretion will have a significant peak. In addition, school-age children need to ensure about 10-12 hours of sleep per day, so it is recommended to go to sleep around 8-9pm. In addition, adolescents should ensure 8-10 hours of sleep, so it is recommended to go to bed before 10 p.m., so that metabolism can be fully replenished and body functions can be restored. Overwork and staying up late will lead to yin and yang imbalance, poor mental state, etc. Therefore, it is necessary to develop good sleep habits and ensure sufficient sleep time.