The hazards of children staying up late include the impact on growth, decreased resistance, and impact on digestive function. 1. Impact on height: Because children rely on the secretion of growth hormone at night, if you stay up late, it is easy to lead to insufficient secretion of growth hormone, which will have a significant impact on the development of height. 2. Decreased resistance: small children stay up late will interfere with the normal sleep structure, the body can not get effective rest, which leads to decreased resistance, poor physical quality. 3. affect the digestive function: children stay up late will lead to digestive system dysfunction, nausea, vomiting and abdominal distension of the possibility of increasing. It is recommended that parents should strengthen the daily care of small children, avoid staying up late, and develop good living habits to help growth and development.