Sleeping hand numbness, may be related to mechanical compression, may also be due to cervical spondylosis, cerebrovascular disease and other causes. 1. Mechanical compression: if you sleep for a long time to maintain a fixed position, resulting in prolonged arm pressure, resulting in poor local blood circulation, may cause hand numbness. This is a normal physiological phenomenon, by changing the position, appropriate activities arm, in favor of hand numbness symptoms soon disappear. 2. cervical spondylosis: the disease when patients sleep if the pillow is not suitable, or sleeping posture, resulting in neck muscle tension, spasm, resulting in local nerve root compression, resulting in dysfunction of the compressed nerves, may cause numbness of the hands, may also be accompanied by neck and shoulder discomfort, numbness of the upper limbs and other symptoms. 3. cerebrovascular disease: common in the presence of cerebral atherosclerosis in the elderly, due to thickening of the blood vessel wall, narrowing of the blood vessel lumen, resulting in insufficient blood supply to the brain or cerebral infarction, resulting in numbness of the hand symptoms, and cerebrovascular disease can also be in the sleep onset, so there can be sleep numbness of the hand symptoms. Sleeping hand numbness, may also be caused by other reasons, if the symptoms continue to be unable to improve, should be as early as possible to seek medical attention, a clear diagnosis of the cause, to give targeted treatment.