Sleeping in the middle of the night hand numbness: 1, consider whether it is a stroke. Middle-aged people over 40 years old, usually have dizziness, headache, numbness of the limbs, if you sleep in the middle of the night suddenly appeared hand numbness, be vigilant is a stroke, if necessary, go to the hospital. 2, the upper extremity of the nerve compression. Sleeping in the middle of the night hand numbness, waking up after the activity can be improved, serious patients will appear hand muscle atrophy, will affect the muscle action of the hand, can also be seen in the carpal tunnel syndrome, elbow syndrome, need to go to the neurology department. 3, cervical spondylosis, is the most common cause of numbness of the hand is one of the diseases of the middle-aged and elderly people. When the degenerative changes in the intervertebral disc, will lead to disc herniation, joint protrusion or hypertrophy, compression of the adjacent cervical nerve root, then there will be this numbness, in severe cases, there will be weakness of the hand, take things off.