Sleeping teeth grinding is called nocturnal teeth grinding, nocturnal teeth grinding may be the gastrointestinal tract parasites, but not necessarily roundworms, but also hookworms, pinworms, etc., in addition to the dental occlusal relationship is not coordinated or psychological factors can also lead to nocturnal teeth grinding, specific as follows. 1. The presence of parasites in the gastrointestinal tract: may stimulate the brain to cause chewing muscle spasm caused by night grinding teeth. 2. Uncoordinated occlusal relationship of teeth: such as malocclusion, dental defects, early contact and so on, leading to unstable occlusion caused by nocturnal teeth grinding. 3. Psychological factors: nervousness, anxiety and other emotions may cause nocturnal teeth grinding. There may be other reasons for nocturnal teeth grinding, if nocturnal teeth grinding is serious, or other symptoms, it is recommended to go to the hospital in a timely manner, with the help of the doctor to clarify the cause of the disease, targeted treatment.