If you regularly wake up with heartburn, a sour taste in your mouth, or an uncomfortable burning sensation in your chest, your sleeping position may be part of the problem. Research suggests that sleeping on your left side can help reduce nighttime acid reflux, while lying on your right side may make it easier for stomach contents to flow back toward the esophagus. This happens because of the stomach’s position and the way gravity affects the junction between the stomach and esophagus.

A 2022 randomized clinical trial involving 100 people with nighttime reflux symptoms investigated a device designed to encourage left-side sleeping by discouraging participants from lying on their right side. Treatment success was reported by 44% of the active-treatment group, compared with 24% of the control group. The results support positional therapy as a possible way to reduce nighttime symptoms, although they don’t mean left-side sleeping will work for everyone or cure GERD.

Doctors also recommend other practical changes. The American College of Gastroenterology suggests avoiding meals within 2–3 hours of bedtime and elevating the head of the bed for nighttime reflux. Raising the upper body with a suitable wedge or bed elevation may help keep stomach contents from moving upward. Smaller evening meals and identifying foods that trigger your symptoms may also help.

So, should everyone sleep on their left side? Not necessarily. If you sleep comfortably on your right and don’t experience reflux, there’s no universal reason to change. But if nighttime heartburn is a regular problem, trying your left side, finishing dinner earlier, and elevating your upper body may be worthwhile. Persistent symptoms deserve medical attention rather than relying on sleeping position alone. 🌙