The symptoms of hand numbness during sleep are caused by the following reasons: 1, incorrect sleep posture, if sleeping on your stomach or sleep compression of the upper limbs will cause insufficient blood supply to the ends of the limbs and hand numbness and other discomfort. The correct sleep posture is right-sided, the symptoms of hand numbness can get up to live the upper limbs will slowly improve, without treatment. 2, lipid abnormalities, blood flow slowed down during sleep, if the usual lipid viscosity will cause cerebral artery supply deficiency and dizziness, limb numbness and other discomfort. 3, if there is usually cervical spine disease, may cause insufficient blood supply to the basilar artery and dizziness, neck discomfort, etc.. Do not stay up late, maintain the correct sleep posture, you can go to the hospital for further examination such as blood lipids, blood pressure, etc. to confirm the diagnosis.