If you bite your tongue in your sleep and wake up in pain, you need to analyze specifically what causes it, and you can visit the emergency department, or you can visit the neurology department, or you can visit the ear, nose and throat department. The clinical symptoms and clinical manifestations of biting the tongue during sleep are caused by poor sleep conditions, inadequate sleep quality or abnormal neuronal discharge of brain cells during sleep caused by neurological disorders and neurological dysfunctions due to neurasthenia, which should be treated systematically at the neurology department. If tongue biting during sleep is accompanied by sleep mania or in extreme cases sleepwalking, irritability, or even hitting, you should go to the emergency department, and if tongue biting causes trauma to the tongue, you should also go to the ear, nose and throat department or oral surgery department.