The symptoms of hand numbness during sleep are caused by the following reasons: 1, incorrect sleeping posture, if the sleeping posture is incorrect during sleep may compress the upper limb, long-term compression of the limb can cause symptoms of inadequate blood supply to the end of the limb, such as hand numbness. 2, cervical spine disease, if there is usually cervical spine disease, sleep in a long-term posture, the protruding intervertebral disc may compress the brachial plexus nerve, causing numbness and other uncomfortable symptoms. 3, lipid abnormalities, blood circulation slows down in the sleep state, if the usual lipid viscosity, resulting in inadequate blood supply to the end of the limb will cause limb numbness, if not timely lipid treatment may cause cerebrovascular diseases such as cerebral infarction. If you don’t take timely lipid-lowering treatment, it may cause cerebrovascular diseases such as cerebral infarction. Normally, you should have good sleep habits, drink more water and exercise properly.