The proper hardness of Pillow

General,, more hard some of Pillow benefit human health, but excellent of pillow makes head and pillow contact surface too little, local pressure had big, makes people was not comfortable, and such is may caused on local neural of oppression had big, in second days morning produced head, and neck, and back, and arm, and hand, at of numb or pain pain, symptoms; had soft of Pillow to keep pillow of height, because too soft on scalp oppression area big, not conducive to blood cycle, while also exists breathable performance poor of problem, cannot guarantee sleep Shi full of breathing Also there may be a security risk.