6. Gives Your Heart a Break
The heart must continue to beat continuously from the moment it is born in order for life to be sustained. This is a huge job and can be affected by many factors, from air quality to diet. No wonder heart disease is the number one killer of adults in the world. Sleeping on your left will make it easier for your heart to do its job.
When you sleep on your side, gravity helps the heart to move blood. The aorta, which carries blood to your rest of the body from the heart, arches left when it starts its journey. The heart works less to pump blood when you lie with your head down.