The back of the head scalp tingling when sleeping, the first consideration is due to sleep lying flat for too long, resulting in the back of the head has been pressed to affect the blood circulation, can appear this scalp tingling. Secondly, the scalp numbness at the back of the head when sleeping is also considered to be the pillow pillow is too high, resulting in the neck muscles have been in a state of pulling, muscle spasm, the patient can appear this back of the occipital scalp numbness. Numbness of the scalp in the occipital area during sleep can also be seen in cervical spondylosis, due to the herniated cervical discs resulting in compression of the dural sac, the patient can experience numbness of the scalp in the neck and the back of the head, and in severe cases, numbness of both upper limbs can also occur. Numbness at the back of the head during sleep can also be considered as a posterior circulation ischemia. Due to the slowing down of blood circulation during sleep, the blood is in a high-fat, high-viscosity state, and the patient can have symptoms of insufficient blood supply to the brainstem and cerebellum, and scalp numbness at the back of the head. For scalp tingling caused by posterior circulation ischemia, it can generally be accompanied by dizziness and other symptoms.