The cause and mechanism of pillow fall is not yet fully clear, generally believed to be due to incorrect sleep posture or pillow is not suitable for muscle spasm, strain. It is currently believed that the onset of pillow fall pillow inappropriate and sleep posture related. Poor sleep posture, excessive head and neck deflection, sleeping pillow is too high, too low or too hard to make the neck in the over-extension, over-flexion state, the local muscles are in a state of tension for a long time and the occurrence of muscle spasm, strain or even sprain, which leads to the patient to appear in the neck and shoulder pain and discomfort, stiffness, movement restriction and other symptoms. If the symptoms of neck pain caused by pillow fall are serious, or the symptoms continue to see no improvement, it is recommended to go to the hospital in time for treatment.