Sleeping with legs up is an involuntary movement of the body, sleeping “legs up” if it is an involuntary movement, 1, common causes are abnormal transient brain discharges, seizures; need to improve the head MRI, dynamic EEG and other further diagnosis; 2, low calcium twitch, can test blood calcium, bone density, etc.; 3 fast moving eye sleep Behavioral disorders, manifested as abnormal limb activity during sleep, sometimes with shouting, can be examined by cranial MRI, sleep monitoring, etc.; getting up legs during sleep is also associated with spasm caused by transient cerebrovascular ischemia, which often occurs in patients with previous history of cerebrovascular disease. For example, patients with cerebral embolism, cerebral thrombosis or sequelae of cerebral hemorrhage are particularly prone to cerebral vascular spasm and stenosis during sleep.