Pillow, a sleep tool. It is generally believed that pillows are fillers that people adopt for sleeping comfort. From the understanding of modern medical research, the spine of the human body is a straight line when viewed from the front, but it has four physiological curved curves when viewed from the side. In order to protect the normal physiological curvature of the neck and maintain normal physiological activities during people's sleep, pillows must be used when sleeping. Pillows generally consist of a pillow core and a pillowcase. If you want to know which brand of pillow is the best, we recommend the top ten pillow brands.