Benign sleep myoclonus is a physiological occurrence of myoclonus during sleep, which is generally common in newborns and can occur during any stage of sleep. Benign sleep myoclonus usually presents as myoclonus, mainly involving the forearms and hands, but also the feet, face, trunk and abdominal muscles, and can be focal, multifocal or generalized, with a twitch frequency of 1-15 times/second, and cannot be stopped by external force. Normal, no abnormal neurological symptoms, no neurological sequelae. It usually decreases after two months of life and disappears within six months, with a good long-term prognosis and no need for treatment.