Causes of vomiting in the middle of the night include overfeeding, gastroenteritis, cerebral hemorrhage and so on. 1. Eating and drinking too much: If the patient eats too much food at night and the body does not digest it, the food accumulates in the stomach. If the patient lies on his back while sleeping, it will increase the impact and stimulation of food on the gastrointestinal tract, resulting in constant contraction of the esophagus and stomach and vomiting. 2. Gastroenteritis: If the patient eats cold, chilly and rotten food, it will produce strong stimulation to the mucous membrane, blood vessels and nerve endings of the stomach, which will cause the mucous membrane of the stomach to contract violently, resulting in abdominal pain, diarrhea and vomiting. 3. Cerebral hemorrhage: If the patient’s blood vessels rupture at night, a large amount of blood retained in the brain tissue, and even the cerebrospinal fluid, increasing the stimulation of the cerebral nerves and the brain to produce great pressure, which will cause the body to projectile vomiting, severe headache, and even loss of consciousness. Vomiting in the middle of the night may also have pyloric obstruction and other reasons, when the patient has symptoms of vomiting in the middle of the night, must carefully observe the physical condition, and promptly to the hospital.