Children who do not sleep at night and cry may be the result of environmental discomfort, improper feeding, digestive system diseases and other reasons. 1. Environmental discomfort: the environment in which a child sleeps is very important, which will directly affect the child’s sleep. If the sleep environment is uncomfortable, such as too much light, too much sound, etc., it will lead to children waking up, crying, and difficulty in falling asleep. Parents can improve this situation by improving the child’s sleep environment. 2. Improper feeding: If too much food is consumed or no food is eaten, it may lead to a situation where the child does not sleep or cries due to bloating, abdominal pain, hunger, and other reasons. Parents can improve this situation by adjusting the time and frequency of feeding. 3. Digestive system diseases: Commonly, there are indigestion, intestinal flatulence, intestinal colic and so on, and the child may suffer from abdominal pain, diarrhea, abdominal distension and other symptoms. Parents can help their children by helping the clockwise massage of the abdomen to relieve the symptoms, if a long time can not be relieved, it is recommended to consult a doctor. Children do not sleep at night crying may also be caused by other reasons, can not relieve the symptoms, it is recommended that parents take their children to the doctor in time, so as not to delay the treatment of the disease.