Children always wake up crying in their sleep may be related to the daytime shock, calcium deficiency, abdominal pain, etc.. 1. Frightened during the day: If a child is frightened during the day, he or she may suddenly wake up and cry during sleep at night, and the baby can be soothed to relieve the symptoms. 2. Calcium deficiency: if the child is malnourished, picky eaters and other causes of calcium deficiency, calcium deficiency may occur at night leg cramps, causing waking up and crying symptoms. 3. Abdominal pain: children with indigestion may have abdominal cramps or intestinal spasms, the pain at night will make the child wake up crying, may also be accompanied by abdominal distension, nausea and other conditions. There may be other reasons why your child always wakes up and cries during sleep, so we recommend that you go to the hospital in time for a complete examination to determine the cause of the problem and then treat it under the guidance of the doctor.