The following conditions should be considered for frequent convulsions during sleep at night: 1. Sleep-type epilepsy. Some seizures often occur in the sleep state, with sudden twitching of the limbs, accompanied by loss of consciousness, eyes rolling upward, and foaming at the mouth. This type of epilepsy has an associated medical history, such as secondary to cerebrovascular disease, intracranial tumors, central nervous system infections, etc. 2. Hypocalcemic convulsions. If the site of the convulsion is limited to the calf muscle only, the limb convulsions caused by low calcium are not excluded. 3. Infantile hypocalcemic convulsions. Infants and young children, because the development of the nervous system is not yet perfect, and growth is relatively rapid, some can show symptoms of nocturnal hypocalcemic convulsions, and can also appear twitching performance of the limbs.