There are several cases of sudden vomiting in the middle of the night without signs: 1, ate unclean food, such as contaminated food, corrupt and moldy food, etc., will produce damage to the beneficial flora in the intestine, which leads to vomiting in the middle of the night. Belonging to the radioactive vomiting is the body’s self-protection, spitting out unclean food, bacteria and viruses will not harm the body. 2, the spleen and stomach cold, in the evening ate a lot of grapes, apples, chilled watermelon, cold drinks, etc., or sleep without covers, abdominal cold will lead to the spleen and stomach cold, thus causing midnight vomiting. 3, acute gastroenteritis, generally ate unclean food, eat too much The first thing you need to do is to eat too much cold food and so on. The function of the stomach and intestines will be affected, it is likely to appear acute gastroenteritis, so there will be vomiting in the middle of the night. 4, mental factors, excessive mental tension, strong mood swings, or smell a very nasty smell, these will stimulate the central nervous system of the brain, it may cause vomiting, generally referred to as mental vomiting.