The advantage is that it can correct the shape of the body and spine (but sleep on your back)

Using pillows can make your sleeping brain have a better rest, because using pillows can reduce the pressure of blood on your brain.

Pillows play an important role in human health. Sleeping without a pillow at night, the head is lower than the heart, the blood flowing to the head will increase, and the blood vessels in the head will be congested.