The causes of numbness in the hands at night sleep are physiological, cerebrovascular disease, diabetes, alert to the inaccuracy of the four disease claims. 1. Physiological: If you sleep under pressure, there will be a brief numbness of the hands, after rest will improve. 2. Vascular occlusive vasculitis: this disease leads to poor blood circulation in the extremities, the metabolism declines at night, which can easily lead to numbness of the fingers. 3. Cerebrovascular disease: transient ischemic attack, cerebral hemorrhage, cerebral infarction, etc. may compress the cerebral nerves, and the symptoms of numbness in the fingers at night. 4. Diabetes mellitus: when long-term elevated blood sugar, peripheral neuritis will occur, causing numbness at the end of the limbs, often symmetrical. In addition carpal tunnel syndrome, elbow tube syndrome can be due to poor posture at night numbness. If a long time to sleep at night hand numbness should be timely to the hospital.