While the source frames this as giving the heart “a break” during rest, no clinical data or cardiology authority is cited to quantify the effect.
Digestion and bowel movement: the ileocecal valve connection
Left-side sleeping is also linked to digestive health through the position of the ileocecal valve, the junction between the small and large intestines. Because this valve sits on the left side of the body, lying on that side is said to help waste move from the small intestine to the large intestine more easily.
Gravity is identified as the key mechanism here, facilitating the natural direction of waste transit and supporting more regular bowel movements.
From the esophagus to the ileocecal valve, the anatomical case for left-side sleeping rests on the physical location of key organs and the directional pull of gravity. For those prone to nighttime heartburn or sluggish digestion, it remains one of the simplest adjustments available — requiring nothing more than a shift in position before lights out.
