The baby suddenly woke up at night and cried, considering the physiological factors, but also may be the manifestation of certain diseases, such as intestinal cramps and other related. 1. Physiological factors: the more common may be the child suddenly woke up in his sleep at night, crying, because some babies may sleep before the mood fluctuations, easy to cause the child to dream at night after the phenomenon of crying, appropriate coaxing and hugging may ease. 2. Intestinal spasm: If a baby suddenly wakes up and cries during sleep, the first thing to consider is that he or she is suffering from intestinal spasm. Most of the intestinal spasms are caused by indigestion, which will cause severe pain in the abdomen, and the child will suddenly cry, especially at night after getting cold, the attacks will be more frequent, you can use your hands to massage the abdomen appropriately. If you exclude physiological causes, you should promptly consult a doctor to specify the cause of the disease and, if necessary, carry out appropriate treatment.