If you feel numbness in your arms when you sleep, you may have spinal cord type cervical spondylosis or nerve root type cervical spondylosis, and you need to actively improve the cervical MRI examination. If it is spinal cord cervical spondylosis, surgery is needed as soon as possible. At the same time, after surgery, use nerve-nourishing drugs such as methylcobalamin capsules, vitamin B and methylcobalamin injection. If it is neurogenic cervical spondylosis, conservative treatment can be carried out first. Correct the posture of the neck, avoid excessive head lowering, sleep on a pillow that is not too high or too soft, avoid prolonged exposure to computers and cell phones, and avoid excessive ambulatory work. Use the nerve-nourishing drug methylcobalamin capsule, oral anti-inflammatory and analgesic drug loxoprofen sodium, and can be treated with sedative mannitol to reduce the swelling of the nerve. In addition, intermittent traction with an inflatable neck brace can effectively reduce the degree of nerve root compression. If conservative treatment is not effective, surgical treatment is required. When sleeping, the arm should not be placed on top of the head or under the head, as this can cause the nerve to be stretched and cause numbness in the arm.