(1) how to properly cushion the pillow during sleep is very important, and the pillow must be placed around the neck. You can test yourself. When you lie down, the lowest place in the chin means that the pillow is too low. If the chin is pressed down, the pillow is too high and the chin should be kept at the level to be a comfortable and correct pillow height.
(two) sleep takes 1/3 of life, and posture is not to be careless. For example, some parents think their bones will grow right if they are allowed to sleep in a hard bed. In fact, the body of the human hip, the waist, shoulder three different meat, hard plate bed can make the body curve can not be attached to the bed, so that it can not relax, uncomfortable and unhealthy.
(three) and a lot of people are used not to cushion the pillow, the head will fall back when sleeping, the pressure of the cervical spine is twice as high as that when it is forward, and it will be a problem for a long time. As for the height of the pillow, young people can be slightly lower, a little higher after age, because the flexibility of the cervical spine will change with age, the older the older, the more rigid, and more support.