The human cervical or lumbar spine in sleep without force, muscles, ligaments should be a better rest or relaxed state, every day sleep up neck, lumbar spine pain symptoms are more obvious relief. If the neck stiffness is more serious in the morning, the possible reasons are the following: First, the height of the pillow is not suitable for sleep, the height of the pillow varies from person to person, generally the appropriate height in about 20-30cm, if the height of the pillow is not suitable for sleep, easy to lead to further contracture of the neck muscles, cervical spine up after the morning more stiff. Second, the posture of sleep, sleep posture is not correct or sleep muscle strength on both sides of the cervical spine is not balanced, will also lead to further contracture and stiffness of the cervical spine muscles symptoms. Third, the muscles in the cervical region are cold and chilled during sleep, which may also aggravate the symptoms of stiff neck in the morning after waking up.