Reasonable height of pillow
The view of "sit back and relax" is extremely harmful. Director Li Zhiguang, a professor at Beijing Medical University, said that only by maintaining the normal physiological state of the cervical spine during sleep can the skin, muscles, ligaments, intervertebral joints, trachea, esophagus and nerves passing through the neck relax and rest with the whole human body. Normal people sleeping on a high pillow, whether lying on their back or on their side, will change the physiological state of the cervical spine and make some local muscles of the neck excessively tense. Over time, the neck muscles will strain and contract, leading to slight changes in the position of the cervical spine, which will stimulate or oppress the nerve roots and blood vessels of the neck, resulting in reflex spasm, and even insufficient blood supply to the brain, resulting in numbness of the neck, shoulders, back and arms, dizziness, headache, decreased vision, tinnitus, nausea, hearing loss and other symptoms. High pillow is one of the common causes of stiff neck and cervical spondylosis.