Numbness of legs in the middle of the night may be related to cold, cerebrovascular disease, lumbar spine disease and other factors. 1. Cold: when patients do not pay attention to foot warmth when sleeping, especially in winter, after the feet are cold, it is easy to lead to numbness in the middle of the night. 2. Cerebrovascular disease: when patients suffer from cerebrovascular disease, such as cerebral infarction, cerebral ischemia, etc., it may cause cerebrovascular abnormality, which may lead to numbness in the middle of the night, and some of the patients are also accompanied by hemiplegia, aphasia, sensory impairment and other symptoms. 3. Lumbar spine diseases: such as lumbar disc herniation, etc., due to prolonged improper posture at night, aggravating the lumbar disc herniation, resulting in nerve root compression, which may occur in the middle of the night numbness of the feet. Other causes may also cause numbness of the feet in the middle of the night, it is recommended that the patient consult a doctor in time for examination and treatment after clarifying the cause of the disease.