Lying on the cervical spine is difficult, the possible causes are too high a pillow, fatigue, cervical spondylosis and so on. 1. Pillow is too high: If you sleep with a pillow that is too high, it can cause neck muscle tension and changes in the physiological curvature of the cervical vertebrae, thus causing neck pain and discomfort. 2. Exhaustion: If you have been in strenuous exercise, after a long period of physical labor, the symptoms of cervical spine discomfort lying down may be caused by overwork and lactic acid accumulation in the muscles, which can be relieved after rest. 3. Cervical spondylosis: because of improper posture, chronic strain injury, cold, etc., caused by cervical spondylosis, cervical degeneration after the neck muscle tension and spasm, physiological curvature straightening, disc herniation and other changes can occur in the neck pain, soreness, stiffness and other symptoms. Neck discomfort after lying down, if it continues to be unrelieved, it is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment.