After waking up, hand numbness, activity after a few seconds will be good, the general situation is caused by arm compression, that is, because of the sleep posture is not correct or compressed to the ulnar nerve caused by hand numbness. How to prevent: first of all, it is necessary to adjust the sleeping posture, to avoid arm compression, pillow size, height should be appropriate to avoid aggravating the possibility of cervical spondylosis, bedding should be comfortable. Secondly, you need to take oral nutritional nerve drugs to prevent, the most common drugs are methylcobalamin, vitamin B1, etc., which can effectively prevent the symptoms of hand numbness. Finally, do not drink alcohol, because alcohol has some damage to the nerves.