Children of different ages do not sleep at exactly the same time at night. children within 1 year of age need a longer sleep time and it is recommended that they go to bed at 7:00 p.m.; children between 1 and 3 years old are recommended to go to bed at 8:00 p.m.; children after 3 years old are recommended to go to bed before 9:00 p.m. The peak of growth hormone secretion in children’s nighttime sleep is usually around 11:00 p.m. Therefore, to ensure that children have entered deep sleep before 11:00 p.m., it is required that children try to fall asleep before 9:00 p.m., because it takes 1-2 hours from falling asleep to entering deep sleep. Only to ensure that the child has good sleep during the peak of growth hormone secretion at night, can the child’s body secrete the hormones needed for growth and development, in order to promote normal growth and development. In addition to this, it is recommended that children sleep for 9-10 hours a day. Adequate sleep can repair the body’s fatigue and help children’s resistance, immunity, as well as the development of intelligence and memory. Good sleep habits are beneficial to children’s growth and development and should be cultivated gradually from the infant stage. At a young age, children should gradually form the biological rules of day and night, so that they can develop the habit of going to sleep before 9:00. Pay attention to keep the room temperature appropriate, maintain at 22-26 ℃, dim the light, keep the room quiet, to create a good sleep environment for children.