For many people with nighttime reflux, lying on the left side may reduce reflux compared with lying on the right side or flat on the back.
2. Why Does the Left Side Make a Difference?
The anatomy of your stomach helps explain the phenomenon.
The stomach sits primarily on the left side of the upper abdomen. When you lie on your left side, the stomach’s contents may remain positioned below the connection between the stomach and esophagus.
By contrast, right-side sleeping can sometimes make it easier for stomach contents to move toward the esophagus.
This doesn’t mean everyone with heartburn must sleep on the left.
But if you frequently experience nighttime reflux, experimenting with left-side sleeping may be worthwhile.
3. Elevating Your Upper Body Can Help Even More
Your sleeping position isn’t the only factor.
For people with frequent nighttime GERD, raising the upper portion of the body can sometimes reduce symptoms.
A wedge pillow that elevates the torso is generally more useful than simply stacking several ordinary pillows under your head.
Why?
Stacking pillows can bend the body at the waist rather than creating a gentle incline through the upper torso.
Lifestyle measures can also help, including avoiding large meals shortly before bedtime.
If nighttime heartburn happens regularly, discuss it with a healthcare professional rather than relying only on sleeping position.
4. Left-Side Sleeping During Pregnancy
Pregnancy is another situation in which side sleeping becomes particularly relevant.
As pregnancy progresses, the growing uterus can affect comfort, breathing, and circulation when lying flat.
Healthcare professionals commonly recommend side sleeping later in pregnancy, particularly after around 28 weeks, because going to sleep on the back may be associated with increased risk of certain pregnancy complications.
The left side has traditionally been recommended because of its relationship to major blood vessels and circulation.
However, the key message isn’t that pregnant people must remain exclusively on the left side all night.
If you wake up on your back, don’t panic. Simply reposition yourself onto your side.
If you’re pregnant and have questions about your individual sleeping position, follow your obstetrician or midwife’s advice.
5. Does Sleeping on the Left Side Improve Heart Health?
This claim needs some clarification.
Your heart is positioned slightly toward the left side of your chest, so you may assume that lying on the left automatically improves circulation.
But there is not strong evidence that healthy people can significantly improve their long-term heart health simply by choosing the left side at night.
In fact, some people notice their heartbeat more strongly when lying on their left side.
This happens because the heart is closer to the chest wall in that position.
You may become more aware of:
Heartbeats
Pounding sensations
Occasional skipped beats
That sensation doesn’t necessarily mean your heart is functioning poorly.
6. Why Can Your Heartbeat Feel Stronger on the Left Side?
