Sleeping in the lateral position is often performed, which has certain benefits to the body. Especially the right side lying position, can reduce the burden on the heart, can make the cervical spine to get sufficient rest, provided that the height of the pillow must be appropriate. If you choose to sleep on the side, the mattress must be moderately soft and hard, not too soft, not too hard. Once the mattress is too soft or too hard, when sleeping in the lateral position, it will make the lumbar spine, thoracic spine physiological bending changes in shape, too long will cause thoracic spine, lumbar spine disease. For example, the lateral ligaments of the thoracic spine have chronic blood circulation disorders and chronic lumbar pain. Frequent side sleepers, especially those who often use a side sleeper position, may cause changes in the shape of the bones of the face, and also cause a slight asymmetry in the muscles on the outside of the bones of the face, thus affecting the appearance of the face.