Numbness in the arms and hands during night sleep may be due to the following reasons: 1, due to incorrect posture during night sleep, or due to inappropriate pillows during night sleep, as well as too high or too low, resulting in obstruction of blood circulation in the upper extremities, and inducing numbness in the arms or hands; 2, may be caused by disease, the most The most common is the spinal cord type of cervical spondylosis, or nerve root type of cervical spondylosis, and induced patients appear numbness of the arm or hand; 3, due to local nerve damage, and induced patients appear numbness of the arm and hand. Therefore, in case of numbness, it is recommended that the patient go to the hospital for a cervical MRI examination to see if it is caused by cervical spondylosis, and then give appropriate treatment measures to treat it.