After falling asleep, hand numbness and the following two factors: First, peripheral circulation disorders, patients fall asleep because the muscles are in a state of rest, there is no muscle contraction to help blood circulation, patients often have poor peripheral circulation, nerve nutrition occurs a mild obstacle, resulting in easy to numbness, waking up after the activities can make the numbness better; Second, cervical spondylosis, cervical spondylosis, if the compression to the nerve root, may make the distal end of the nerve nutritional disorders, easy to numbness, the degree of this numbness is generally not heavy. Second, cervical spondylosis, cervical spondylosis if the compression of the nerve root, may make the distal end of the nerve nutritional disorders, prone to numbness, the degree of this numbness is generally not heavy. When combined with peripheral circulation disorder during sleep, the symptoms will be more obvious. It is recommended that patients with numbness in the hands during sleep should improve the examination of blood glucose, blood lipids, blood rheology, nerve conduction velocity of both upper limbs and magnetic resonance of the cervical spine, so as to clarify whether there is hyperglycemia, hyperlipidemia, elevated blood viscosity, whether there is peripheral injury of the nerves of the upper limbs, and whether there is cervical spondylosis that compresses the nerve roots.