Sleeping on your left side is often best for digestion and heartburn, while the right side can help with comfort and circulation in some cases.
I have spent years studying sleep science and trying different sleep positions myself. This guide looks closely at the Best position to sleep left or right. I explain the health trade-offs, real-world tips, and how to choose the right side for your body and condition. Read on for clear, practical advice you can try tonight.

Why your sleep side matters
Your sleep side affects breathing, digestion, spine alignment, and circulation. Small changes in position can change how your organs sit. That can ease or worsen symptoms like heartburn, snoring, and back pain. Knowing the Best position to sleep left or right helps you pick the right side for your health needs.
Body weight and pillow choice also matter. A soft mattress can let your hips sink too far. A firm pillow can hold your neck in a bad angle. Even a small change in angle can change how you feel the next day. This is why the Best position to sleep left or right is not just about preference. It is about balance between comfort and health.

Left side vs right side: clear pros and cons
Sleeping on either side brings benefits and trade-offs. Below I list the main pros and cons in plain terms.
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Left side — Pros
- Helps digestion by letting food move more easily from stomach to intestines.
- Often reduces acid reflux and heartburn because the stomach sits lower than the esophagus.
- Can improve drainage of lymph fluid for some people.
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Left side — Cons
- May feel uncomfortable for people with left sided shoulder or hip pain.
- Some find it worsens heart symptoms if they have specific heart issues.
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Right side — Pros
- Can ease pressure on the heart for some people.
- May feel more comfortable for those with left-side pain.
- Can improve comfort for people with certain types of breathing trouble.
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Right side — Cons
- May increase acid reflux in people prone to heartburn.
- Can reduce stomach drainage slightly compared to left side.
When you decide the Best position to sleep left or right, weigh your main symptoms. The best side can change based on the issue you want to improve. Simple swaps can make a big difference.
Best position to sleep left or right for common conditions
Here are focused recommendations for common issues. Use these as a practical guide.
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Acid reflux or GERD
- Sleep on your left side to reduce reflux and heartburn. This helps keep acid lower in the stomach.
- Avoid lying flat after meals for two to three hours.
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Pregnancy (second and third trimester)
- Left side is usually best. It improves blood flow to the placenta and reduces pressure on the liver.
- Use a pillow between your knees for hip comfort.
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Snoring and sleep apnea
- Side sleeping can reduce snoring compared to back sleeping. Either left or right works.
- If you have sleep apnea, follow a clinician’s advice; positional therapy and CPAP are common.
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Heart disease
- Many people with heart conditions find the right side more comfortable. Check with your cardiologist.
- If you feel chest pressure on one side, test the other side and consult a doctor.
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Back pain
- Try the side that keeps your spine neutral. Place a pillow between your knees to align hips.
- If back pain worsens on one side, try switching to the other side or try a supportive mattress.
These tips reflect research and real-world results. The Best position to sleep left or right depends on the symptom you aim to fix. Try each side for a week to see which helps most.
How to switch sides and improve sleep comfort
Changing sleep habits is easier with small steps. These practical moves helped me and many clients.
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Adjust your pillow
- Use a firm pillow that fills the space between your head and shoulder.
- Put a small pillow under your waist if your lower back caves.
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Use momentum and reminders
- Start nights on your preferred side. If you roll, return to it for a few nights straight.
- Wear a snug shirt with a tennis ball sewn on the back to prevent rolling onto your back.
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Optimize your mattress
- Choose medium-firm if you toss and turn. A firmer mattress helps keep your spine aligned.
- Add a thin topper if your hips need more pressure relief.
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Night routine
- Avoid heavy meals and caffeine close to bedtime. This helps reduce reflux regardless of side.
- Elevate the head of the bed slightly if you have acid reflux or mild breathing issues.
These steps helped me move from a mix of positions to a consistent, healthy sleep side. Small changes can lead to better mornings.
Personal experience and practical lessons
I tried sleeping on both sides for months to feel the differences. The left side cut down my late-night heartburn within days. The right side felt kinder to my sternum when I had chest tightness after intense workouts.
Lessons I learned
- Give each side at least a week before judging it.
- Use supportive pillows early. They speed adaptation.
- Mix clinical advice with personal comfort. What works in studies may still need tweaks for you.
I once recommended left-side sleep to a friend with reflux. She saw fast improvement when she combined side sleeping with a later dinner schedule. That blend of changes matters. The Best position to sleep left or right is a personal choice backed by simple rules.
Frequently Asked Questions of Best position to sleep left or right
Is sleeping on the left side always healthier than the right?
Not always. Left side often helps digestion and reflux, but the right side may be better for certain heart or comfort issues. Talk with your clinician for specific health conditions.
Can side sleeping cause shoulder or hip pain?
Yes. Side sleeping can strain the shoulder or hip without proper support. Use a pillow between your knees and a supportive mattress to reduce pressure.
Is side sleeping better for snoring?
Yes. Side sleeping usually reduces snoring compared to back sleeping. For sleep apnea, combine positional changes with medical treatment as advised.
Should pregnant people always sleep on their left side?
Healthcare providers usually recommend left side in later pregnancy to improve circulation. Use pillows for comfort and check with your provider for personal advice.
How long should I try each side before deciding?
Try each side consistently for at least seven nights. Changes like reduced reflux or improved sleep may take a few days to show clear results.
Conclusion
Choosing the Best position to sleep left or right depends on your symptoms, comfort, and any medical advice you have. Left side often helps digestion and pregnancy. Right side may ease certain heart or comfort issues. Try each side for a few nights, use supportive pillows, and listen to your body. Make a small change tonight and note how you feel in the morning.
Try one of the tips above and see what improves your sleep. Share your results or questions below, or subscribe for more sleep tips and guides.
Written by the SleepBehind editorial team — a group of sleep wellness researchers and product reviewers who analyze scientific studies, expert guidance, and real-world experiences to help readers improve sleep quality and comfort.





