Which Side Should You Sleep On for Acid Reflux?What Studies Show
Bloating & DigestionArticleIf heartburn wakes you at night, the side you sleep on may matter. In an Amsterdam study that tracked 57 people's sleep position alongside acid monitoring, lying on the left side went with less acid in the esophagus and faster clearance than lying on the right or on the back. In a follow-up trial of 100 people, a wearable that buzzed when they rolled onto their right side helped 44%, against 24% with a sham. Here is what to try.
Night-time heartburn can wake you with a burning chest or a sour taste. Most advice focuses on what and when you eat. Researchers in Amsterdam looked at something simpler: which side you sleep on.
The position study
57 people having their reflux monitored over a day and night also wore a device that recorded their sleep position.1
| Sleep position | Time with acid in the esophagus (median) | Time to clear acid (median) |
|---|---|---|
| Left side | 0.0%1 | 35 seconds1 |
| On the back | 0.6%1 | 76 seconds1 |
| Right side | 1.2%1 | 90 seconds1 |
Lying on the left side went with less acid and faster clearing than lying on the back or the right side.1
The trial
The same team then tested whether nudging people onto their left side helped. 100 people with night-time reflux were advised to sleep on their left and given a wearable device.2 In one group it vibrated whenever they rolled onto their right side; in the other, a sham, it only vibrated in the first 20 minutes.2
| Buzz on the right side | Sham | |
|---|---|---|
| Night-time reflux symptoms cut by half or more | 44%2 | 24%2 |
| Time spent on the left side | 61%2 | 39%2 |
Other things that help at night
UK advice for heartburn includes:3
- Don’t eat in the 3 or 4 hours before bed.
- Eat smaller, more frequent meals, and lose weight if you’re overweight.
- Raise the head of the bed 10 to 20 cm with blocks or books, so your chest is above your waist; extra pillows can make it worse by pressing on your belly. See raising the bed for night-time heartburn.
When to see a doctor
See a GP for heartburn most days, or with food getting stuck, frequent vomiting or unexplained weight loss.3 See heartburn and when it’s GERD.
Try: “I wake with heartburn several nights a week even though I eat early. Would sleeping on my left side or raising the bed help, and do I need any tests?”
Bloated by Dinner covers reflux alongside belching in Chapter 5, “Ten to Twenty a Day,” in a section called “Two Kinds of Burp.” Its Belly Clock logs meal times and when symptoms hit, so you can see whether late meals line up with bad nights. See the book.
This article is for general educational purposes only and is not medical advice. It isn't a substitute for diagnosis or treatment from a qualified healthcare professional who knows your health history. See a doctor for heartburn most days, food sticking, frequent vomiting or weight loss you can't explain. Get emergency help for chest pain that could be your heart. Girl Playbook does not endorse any specific product, test, or provider.
Girl Playbook sells this book. It provides education and worksheets, not individualized medical care.
Sources
The research behind this article, in the order it’s cited. How we source our articles.
- American Journal of Gastroenterology (abstract via PubMed), 2022Associations Between Sleep Position and Nocturnal Gastroesophageal Reflux: A Study Using Concurrent Monitoring of Sleep Position and Esophageal pH and Impedance (opens in a new tab)abcdefgh
- Clinical Gastroenterology and Hepatology journal (abstract via PubMed), 2022Sleep Positional Therapy for Nocturnal Gastroesophageal Reflux: A Double-Blind, Randomized, Sham-Controlled Trial (opens in a new tab)abcdef
- NHS, 2026Heartburn and acid reflux (opens in a new tab)ab
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