In general, harder pillows (such as the three physiotherapy pillows and double-sided dual-use health pillows) are good for human health. Especially for the cervical spine. But the hard pillow makes the head and the pillow contact. Too little, partial pressure is too large, making people feel uncomfortable, and this is likely to cause excessive compression of local nerves, and numbness or pain in the head, neck, back, arms, hands, etc. in the next morning. .
A soft pillow is not good, it is difficult to maintain the height of the pillow, and another too soft to the scalp compression area is large, which is not conducive to blood circulation, and also has poor ventilation performance, can not guarantee adequate breathing during sleep, may also There are security risks.
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