circulation, and comfort.
One of the most noted effects is on acid reflux. When lying on the left side, the stomach sits below the esophagus, which can help reduce the backflow of stomach acid. This may lessen nighttime heartburn and improve sleep quality for some people.
In contrast, other positions can make reflux more likely by allowing stomach acid to move upward more easily. Over time, repeated irritation may disrupt rest and contribute to discomfort, making posture an important factor for those with digestive sensitivity.
Sleeping position may also influence circulation. The heart continues working throughout sleep, and certain positions may reduce strain on blood flow. Left-side sleeping is thought to support smoother circulation by reducing pressure on major vessels.
Organs such as the liver and spleen may also be affected by positioning. With the liver on the right side, left-side sleeping may reduce compression, while the spleen may benefit from improved blood flow, supporting their normal functions.