Under normal circumstances, a person’s muscles should be in a state of relaxation during sleep, and there will be no shaking. The body is always shaking during sleep, may be related to physiological factors, may also be due to the body calcium deficiency, seizures and other reasons, need to be combined with the specific circumstances of the specific analysis. 1. Physiological factors: the occasional body jerking before sleep is generally sleep jumping, which is caused by the dysfunction of the nervous system during the transformation of sleep-wakefulness. If the recent mental overstress, anxiety, too fatigue, may affect this function, which may cause falling asleep body jerks. Lifestyle changes can prevent another attack. 2. Calcium deficiency: When the body is deficient in calcium, due to the reduction of calcium ions, it is easy to lead to increased neuromuscular excitability, which may cause the body to fall asleep and always shake, and may be accompanied by twitching of the hands and feet, restlessness and other manifestations. It is recommended to check the calcium ion level in the hospital and follow the doctor’s instructions for treatment. 3. Epileptic seizures: Some people with a history of epilepsy may experience focal seizures after falling asleep, which may cause the body to keep shaking while asleep, and may be accompanied by foaming at the mouth and transient impaired consciousness. It is recommended to consult a doctor for examination to avoid delay. If you fall asleep and your body keeps shaking, and if it is accompanied by other obvious uncomfortable symptoms, you should consult a doctor as soon as possible, and after a clear diagnosis of the cause of the symptoms, you should be guided by a doctor to carry out the treatment.