Of all the positions, researchers agree that sleeping on your left side offers the most health benefits. This is a position you should adopt immediately, especially if you suffer from digestive problems, poor circulation, or lower back pain.
Sleeping on your left side: the unexpected benefits

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Improved digestion: a beneficial gravity effect

Imagine your digestive system as a roller coaster. When you sleep on your left side, gravity facilitates the transport of waste through the colon—from the ascending colon to the descending colon. This little natural boost eases intestinal transit and makes for a lighter, more pleasant morning.
This is also good news for people with irritable bowel syndrome (IBS) or frequent bloating. This position keeps the stomach below the esophagus, reducing acid reflux and heartburn.