If heartburn keeps you up at night, the way you lie down could be part of the problem — or part of the solution. A simple shift in position may bring real relief.
Why Lying Down Makes Reflux Worse
Acid reflux happens when stomach acid escapes back up into the esophagus, causing the burning discomfort known as heartburn. During the day, gravity helps keep that acid where it belongs. But when you lie flat at night, that natural advantage disappears — acid can flow more freely toward the esophagus, which is why reflux symptoms so often flare in bed. What many people don’t realise is that the specific position you sleep in can meaningfully increase or decrease how much acid makes that journey.
The Best and Worst Positions for Reflux
Sleeping on Your Left Side — The Best Choice
Doctors widely agree that sleeping on your left side is the most reflux-friendly position. Because of the natural anatomy of the stomach and the angle where it meets the esophagus, lying on the left keeps the junction above the level of stomach acid, making it harder for acid to splash back up. Many people with frequent nighttime heartburn find this single change brings noticeable relief.
Sleeping on Your Right Side — Often the Worst
The right side tends to be the least helpful position. Lying this way can relax the valve between the stomach and esophagus (the lower esophageal sphincter) and positions the stomach so that acid pools near the opening, making reflux more likely. If you’re a dedicated right-side sleeper with heartburn, switching sides is worth a try.
Sleeping on Your Back
Back sleeping is a mixed bag. Lying completely flat allows acid to travel back up easily, and in more severe cases there’s a risk of acid reaching the throat or airway. However, back sleeping becomes much safer for reflux when the upper body is elevated — which brings us to one of the most effective changes you can make.
Sleeping on Your Stomach
Stomach sleeping is generally not recommended for reflux sufferers, as it can place pressure on the abdomen and offers little of the protective benefit that left-side sleeping provides. It can also strain the neck and back.
Elevate the Head of Your Bed
One of the most powerful adjustments is raising the head of your bed by around six to eight inches so that your upper body is gently inclined. This uses gravity to keep acid down through the night. Note that piling up extra pillows usually doesn’t work well — it bends you at the waist and can actually increase abdominal pressure. Instead, use a wedge pillow or place sturdy risers under the bedposts at the head of the bed so your whole torso is on a gentle slope.
Other Nighttime Habits That Help
- Avoid eating within two to three hours of bedtime, giving your stomach time to empty
- Steer clear of common triggers in the evening — spicy or fatty foods, chocolate, caffeine, alcohol, citrus, and carbonated drinks
- Eat smaller evening meals rather than one large one
- Wear loose clothing to bed to avoid pressure on the abdomen
- Maintain a healthy weight, as excess weight increases pressure on the stomach
- Quit smoking, which weakens the valve that keeps acid down
When to See a Doctor
Occasional heartburn is common and usually manageable with these adjustments. But if you experience reflux more than a couple of times a week, if symptoms persist despite lifestyle changes, or if you have difficulty swallowing, unexplained weight loss, persistent chest pain, or the sensation of food sticking, see a doctor. Frequent, untreated acid reflux can develop into GERD (gastroesophageal reflux disease) and, over time, damage the esophagus — so ongoing symptoms deserve proper evaluation.
