Frequent twitching after falling asleep is considered to be caused by calcium deficiency, mental overstress, epilepsy and other reasons. 1. Calcium deficiency: It is more common in adolescents and children during the growth and development period. Calcium deficiency will lead to muscle and nerve excitation, thus causing frequent convulsions after falling asleep. 2. Excessive mental tension: excessive mental tension or participation in strenuous exercise during the day, this situation will lead to neuromuscular hyperactivity, which may lead to frequent convulsions at night. 3. Epilepsy: Abnormal neuronal discharges can lead to epilepsy, different types of epilepsy seizure time as well as the characteristics of the seizure is not the same, a small number of epilepsy is a seizure during sleep. Frequent convulsions of the body after falling asleep may also be restless legs syndrome, periodic limb movement disorder. The occurrence of this manifestation should be promptly examined under the guidance of a specialized doctor to clarify the cause of the disease and give appropriate treatment.