When the patient bites his tongue while sleeping, it is considered that it occurs when the patient is dreaming, and the presence of schizophrenia may also lead to the phenomenon of tongue biting. Of course, we should also pay attention to the presence of epilepsy and the phenomenon of tongue biting. If the patient repeatedly bites his or her tongue while sleeping, further tests should be performed to determine if the disease is the cause, with particular attention to epilepsy. An electroencephalogram (EEG), a CT scan of the brain, or an MRI can be performed to rule out whether a disease is causing the tongue biting. When the patient is sleeping, the height of the pillow should not be too high and the pillow should be placed under the neck, which can open the patient’s airway and facilitate the supply of oxygen and blood to the brain.