There are several reasons for biting the tongue in sleep: First, the tongue itself, some people have a large tongue or swollen tongue due to inflammation, resulting in sleep biting the tongue. Second, the function of the bite muscle disorder, for example, in the process of sleep, the mouth is stimulated, the bite muscle suddenly contracted may bite the tongue. Third, some people’s teeth are not aligned and have defects, which may bite the tongue. Fourth, caused by the movement of the teeth, some people are more excited in the process of sleeping nerves, have the symptoms of grinding teeth, it is easy to bite the tongue. Fifth, the lack of certain nutrients caused by the oral zinc gluconate can be taken to regulate, it is recommended to go to the stomatology department for examination, if necessary, laboratory tests of trace elements, under the guidance of doctors symptomatic treatment.