Numbness while sleeping may be caused by incorrect sleeping posture, cervical spondylosis, transient cerebral ischemia, peripheral neuritis, cerebral infarction and so on. 1. Incorrect sleeping posture: Occasional numbness of the hand is not a cause for concern, mainly due to the pressure on the arm during sleep, resulting in poor blood circulation. 2. Cervical spondylosis: due to the patient’s frequent low head, overwork, poor posture, use of pillows inappropriate, etc., will lead to the onset of cervical spondylosis, and at the same time appeared in the hand numbness during sleep. 3. Transient cerebral ischemia: transient neurological deficit due to focal ischemia of the brain, spinal cord or retina, resulting in insufficient blood supply to the brain, which will trigger the phenomenon of hand numbness. 4. Peripheral neuritis: when the patient suffers from peripheral neuritis, there will be poor peripheral blood circulation, resulting in patients with sensory deficits, causing numbness during sleep. 5. Cerebral infarction: the blood supply in the brain is impaired, ischemic necrosis or softening of limited brain tissues caused by ischemia and hypoxia, which leads to the phenomenon of numbness of the hands while sleeping, and the numbness of the hands may continue to be unrelieved, accompanied by weakness of the limbs, dysfunction of speech, dizziness, nausea and vomiting, etc. Those who have cerebral stenosis in the past, and those who have poor control of the risk factors of hypertension, high blood lipids, and high blood glucose, should consider this disease. This disease should be considered. It is recommended that patients go to regular hospitals in time, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment.