When sitting, standing or squatting for a long time, the blood in the lower extremities can not be supplied to the brain, resulting in a temporary shortage of blood supply to the brain, the body can feel uncontrolled, generally seen in frail people and usually low blood pressure, no need to worry. It is recommended that a routine physical examination be conducted to check blood pressure and electrocardiogram. The uncontrolled body movement is related to abnormal brain discharge, to exclude the possibility of focal epilepsy, you can go to the neurology department for further examination and clarification. If someone wakes him up or pushes him, he will disappear immediately. When a person suddenly wakes up from a dream, part of the brain’s nerve center is already awake, but the nerve center that governs the muscles is not yet fully awake, so although there is a feeling of discomfort but can not move, it is recommended to relax and rest properly to reduce fatigue and stress.