Sleeping at night and biting teeth squeaking is because of grinding teeth in the middle of the night, the cause of grinding teeth in the middle of the night may be parasites, mental problems, dental and jaw factors. 1. Parasites: If the human body is infected with parasites such as roundworms, the substances secreted by the parasites may stimulate the brain nerves, leading to teeth grinding in the middle of the night, or parasites living in the intestinal tract may also lead to the symptom of teeth grinding in the middle of the night. 2. Mental problems: Usually mental stress, excessive life pressure, personal anxiety or depression may lead to the symptoms of teeth grinding in the middle of the night. 3. Dental factors: Bite disorder is one of the main reasons for teeth grinding in the middle of the night, such as the patient’s neighboring teeth tilted due to long-term missing teeth, uneven wear and tear on both sides of the teeth, and inappropriate dentures, etc., all of which may lead to the symptoms of teeth grinding in the middle of the night. There are many reasons for squeaky teeth clenching in the night sleep, and patients are advised to actively seek medical attention and regular treatment.