Sleeping position may seem like a small detail in your nightly routine, but according to health experts and sleep researchers, it can make a meaningful difference in how your body functions overnight. Among all sleep positions, sleeping on your left side is often considered one of the healthiest choices — and many people are not even aware of its benefits.
Here is why this simple habit could positively impact your digestion, heart health, and overall well-being.
1. Better Digestion and Reduced Acid Reflux
Your stomach and pancreas are positioned slightly toward the left side of your body. When you sleep on your left side, gravity helps keep stomach acid where it belongs — inside your stomach.
Studies associated with the American College of Gastroenterology suggest that side sleeping, especially on the left, can reduce symptoms of acid reflux and heartburn. On the other hand, sleeping on your right side may allow stomach acid to flow back into the esophagus more easily.
For people who suffer from gastroesophageal reflux disease (GERD), this small adjustment can significantly reduce nighttime discomfort.
2. Improved Heart Function
Your heart is slightly tilted to the left side of your chest. When you lie on your left side, gravity may help facilitate better blood flow from the heart to the rest of the body.
While research is ongoing, some cardiovascular specialists believe that left-side sleeping may reduce pressure on major blood vessels and improve circulation, particularly for pregnant women.
3. Supports the Lymphatic System
The lymphatic system plays a crucial role in detoxifying the body and removing waste. Interestingly, the dominant lymphatic drainage pathway (the thoracic duct) is located on the left side.
Sleeping on your left side may help your body more efficiently filter lymph fluid and remove toxins overnight, allowing your immune system to function more effectively.
4. Helps Pregnant Women
Doctors frequently recommend left-side sleeping during pregnancy. According to guidance from the American Pregnancy Association, this position improves circulation to the heart, fetus, uterus, and kidneys.
It also helps reduce pressure on the liver, which is located on the right side of the body.
5. May Reduce Snoring and Sleep Apnea Symptoms
Sleeping on your back can cause the tongue and soft tissues in the throat to collapse backward, partially blocking the airway. Side sleeping — including the left side — can help keep airways more open.
For individuals with mild obstructive sleep apnea, this position may help reduce symptoms.
6. Supports Natural Detox During Sleep
While the body detoxifies through the liver and kidneys, research suggests that sleep plays a vital role in brain cleansing through the glymphatic system. Although studies do not definitively prove that left-side sleeping is superior, side sleeping in general may support more efficient waste clearance from the brain.
How to Train Yourself to Sleep on Your Left Side
