Children who cry in the middle of the night may be related to environmental factors, daytime fright, physical discomfort and so on. 1. Environmental factors: children sleep in a bad environment, such as hot or cold, will cause discomfort, resulting in crying. 2. Frightened during the daytime: if the child is frightened during the daytime, the child will not be able to sleep soundly and will cry at night. 3. Physical discomfort: children’s physical discomfort, such as indigestion, abdominal distension, abdominal pain and other symptoms of discomfort, causing children to cry in the middle of the night. Children crying in the middle of the night may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor’s treatment.