Speaking of pillows, people tend to think of the idiom “high pillow without worry”, thinking that sleep is appropriate high pillow. In fact, the high pillow is not beneficial to people, and the appropriate pillow is conducive to the relaxation of the whole body, protect the neck and brain, can promote and improve sleep. Therefore, the choice of pillow should generally pay attention to the following points: 1, the height: modern research that the pillow to slightly below the shoulder to the same side of the neck distance is appropriate. Pillow height is based on the physiological curve of the human neck 7 cervical vertebrae arrangement and determined, only to adapt to this physiological bending, in order to make the shoulder and neck muscles, ligaments and joints in a relaxed state, the pillow is too high and too low are harmful. High pillow hinder the head blood circulation, easy to cause cerebral ischemia, snoring and pillow, and not as people often say “high pillow without worry”; low pillow to make the head congestion, easy to cause eyelids and face swelling, especially, when suffering from hypertension, heart disease more beneficial to choose the right pillow. 2, length width: pillow to slightly longer appropriate, the length of the pillow should be enough to sleep after turning a body position. Pillow is not easy too wide, too wide is more than the head and neck joints, muscle tension, to 15 ~ 20cm is appropriate. 3, hardness and softness: pillow with moderate hardness, slightly elastic for good. Pillow too hard, the head and neck and pillow contact with the relative pressure increases, causing head discomfort; pillow too soft, it is difficult to maintain a normal height, so that the head and neck do not get a certain support and fatigue; pillow elasticity is too large, the head is constantly subject to the role of external elasticity, easy to produce muscle fatigue and injury. Therefore, the general pillow core more than the choice of rice hulls, buckwheat bark, cotton, feather pieces, loose foam gum, etc., soft and hard, slightly elastic, for sleep and health are beneficial.