Suddenly shaking halfway through sleep is usually the occurrence of myokinesia. This is because the neurons in the cerebral cortex are in a state of inhibition after the patient falls asleep, losing control of the lower centers, and the lower neurons are easily overexcited, which may cause neuronal activity and muscle contraction when subjected to mild electrical stimulation. This is a normal physiological phenomenon, and 70% of the normal population has experienced this sensation of muscle movement at one time or another. If frequent episodes occur, it is necessary to consider whether the patient has mental anxiety, tension, stress, etc., which can be self-regulated.