What's the best position to sleep?

The worst position for sleeping: stomach sleeping. This is because you have to turn the head and holding your neck in a turned position creates a loss of curve in the neck. Because the liver is 3 pounds and heavy, sleeping on the left side can add extra weight on the heart, which is on the left side. So the best position to sleep is on the right side so the heart sits ON the liver, versus the other way around.