What's the advantage of sleeping on a hard pillow?
Height: whether sleeping or sleeping, it is better to choose a pillow that can keep the normal physiological radian of the neck. Adults should be 15 cm high when they lie on their back or on their side. As the saying goes, in fact, nothing that sleep without any anxiety, too cervical anteflexion, neck soft tissue tension, fatigue, easy to have felt, in the course of time can also cause neck bones morphologic changes, such as physical bending straight, the zhang. Some people like the pillow sleep or pillow too low, this is not good, will make the head congestion, prone to eyelid and facial edema, and the lower jaw will therefore lift up, easy to open mouth breathing, snoring.
There are a lot of scientific and medical bases on how to use pillows.Temperature: after sleep, the head temperature is generally at 34 - 34.5 degrees Celsius, a few degrees lower than the body temperature, if the head temperature is too high, it is difficult to sleep. Therefore, different latitude, different seasons, people choose the cool pillow, warm pillow is also very different, the average person in the summer often on the pillow plus a mat. Therefore, the pillow should be in accordance with the local and seasonal characteristics, so that the head to maintain the best sleep temperature.
Hardness: excellent pillow, and head of the contact area is reduced, the pressure increases, the scalp will feel uncomfortable, and the pillow is too soft, difficult to maintain a certain height, can cause the unobstructed breathing neck muscle fatigue and impact, not conducive to sleep. The pillow is soft and does not lose a certain degree of hardness in order to reduce the pressure between the scalp and to maintain uneven pressure, so that the blood circulation can be passed from the less pressure. In addition, people's head shape is also related to the initial pillow, the pillow should be soft and moderate, and pay attention to adjust the head angle from time to time, so as not to grow back shape is not good.
