An adult, a day of sleep, the normal should be 7 to 9 hours. In other words, one third of life is spent in bed. Most people will feel relaxed after sleeping, but some people will wake up with neck and shoulder pain, and almost everyone has had the experience of “pillow”. This means that at the time of sleep, your cervical spine is not always enjoy a relaxed state, and the cause of cervical discomfort such as pillow is – pillow. So, how the pillow is the right pillow? A principle: the pillow is not used to cushion the head, but used to cushion the neck. 1, cervical spondylosis If we use too high pillow when sleeping, equivalent to the entire sleep process are forced to be in a low state, long-term will continue to straighten the cervical physiological curvature, causing damage, easy to cause cervical spondylosis. 2, brain atrophy long time pillow high pillow, will make the head long-term in the case of insufficient blood supply and oxygen supply, will affect the metabolism of brain cells, resulting in memory loss, the elderly early brain dementia, brain atrophy lesions. 3, sudden death unreasonable pillow is also an important factor in triggering cardiovascular disease, cerebral hemorrhage, stroke and other dangerous diseases. Irrational pillow, will cause brain ischemia, triggering brain damage, while blood pressure increases, heart rate accelerates, making the heart ischemia, hypoxia, and aggravate the disease and even induce death. 4, affect the breathing pillow is too low will lead to unbalanced blood supply to the body, easy to cause congestion and swelling of the nasal mucosa. And the nasal mucosa is very sensitive, a swelling will affect the whistle. 5, vision loss Many people do not know that the wrong pillow also has a relationship with people’s vision. When the cervical spine can not maintain the natural physiological curvature, it will compress the optic nerve. The end result is: vision loss, photophobia, tearing, eye swelling pain and other symptoms, and in serious cases, even lead to blindness. 6, hypertension There is a kind of hypertension called “cervical hypertension”, is the pillow is not suitable to cause. The so-called cervical hypertension, is due to cervical compression of the carotid artery, blood flow is slow, resulting in enhanced pressure. Now there are more and more cases of hypertension in young people, in addition to playing with their heads down on the phone, but also with the wrong pillow. 7, stiff shoulders The pillow is too high, it will make muscle fatigue injury and ligament strain injury, produce spasm, inflammation, etc., and neck and shoulder pain, hand numbness, dizziness and other symptoms. 8, insomnia Research shows that about 600 million insomniacs worldwide, 150 million are caused by pillow discomfort, and the unscientific use of pillows is also the primary factor triggering various sleep disorders. Ordinary pillows because of the material, pillow type, soft and hard degree of unscientific, will cause insufficient blood supply to the brain, and directly affect the central nervous regulation of sleep, resulting in sleep disorders, serious cases will cause long-term habitual insomnia. 9, snoring Some people like to sleep without a pillow. People lying on their backs excessively back, easy to open mouth whistling, which produces dry mouth, dry tongue, sore throat and snoring phenomenon. The role of the pillow is to maintain the physiological curvature of the cervical spine Remember a formula: the general pillow height to 8 to 15cm is appropriate, or according to the formula: (shoulder width – head width) รท 2. If you are used to lying on your back, then the height of the pillow is best 8 to 13 cm, which is the height of your own fist, at the same time, you can put a pillow under the knee again to relieve the pressure on the crestal spine. If you are used to lying on your side, then the height of the pillow should be equal to the width of your shoulders, that is, 13 to 16 cm, so that the cervical and lumbar spine in almost the same horizontal line.