Children sleeping after 10 o’clock is easy to affect the secretion of growth hormone, late to bed and stay up late can lead to decreased resistance, the next day no spirit to affect the study and so on. 1. lead to less growth hormone secretion: 10 p.m. to 1 a.m. is the most vigorous stage of growth hormone secretion, the child does not sleep before 10 p.m. will reduce the secretion of growth hormone, a long time the vicious circle is likely to lead to short stature. 2. Decrease in resistance: babies go to bed after ten o’clock, it is easy to have insufficient sleep, it is easy to have a decrease in resistance. 3. Impact on learning: sleep after 10 pm, the brain does not get enough rest, will affect the baby the next day to learn the spirit of the class, easy to lead to fatigue, fatigue occurs, may affect the academic performance. The harm of children sleeping after 10 p.m. is more, in order to protect the healthy development of children, try to let the baby to ensure adequate sleep, so as not to affect the baby’s learning life.