Doctors Say Your Sleeping Position Could Affect Your Health—Especially If You Sleep on Your Right Side

The position you sleep in may seem like a simple matter of comfort, but it can influence digestion, acid reflux, breathing, circulation, and even how well you sleep. While there is no single “perfect” sleeping position for everyone, research suggests that side-sleeping—and particularly choosing the left or right side—can make a meaningful difference for certain people.

One reason is anatomy. Your stomach, esophagus, lungs, heart, and other organs have specific positions inside your body. Changing the way you lie down can alter how gravity affects stomach contents and how easily acid moves toward the esophagus.

The image above highlights an important distinction between sleeping on the right side and sleeping on the left side, especially when it comes to digestion and nighttime heartburn.

Why Sleeping on Your Right Side May Trigger More Reflux

For people who experience acid reflux or gastroesophageal reflux disease (GERD), sleeping on the right side may sometimes make symptoms worse.

When you lie on your right side, the position of the stomach can make it easier for stomach contents to come closer to the opening of the esophagus. If the lower esophageal sphincter relaxes or doesn't close effectively, acidic stomach contents may travel upward.

This can cause symptoms such as:

• Heartburn
• A sour or bitter taste
• Regurgitation
• Burning in the chest or throat
• Nighttime coughing
• Hoarseness
• A feeling of food coming back up

This doesn't mean everyone who sleeps on their right side will develop reflux. Many people can sleep comfortably on that side without any problem.

However, if you consistently wake up with heartburn after sleeping on your right side, your sleeping position may be worth reconsidering.

Why the Left Side May Be Better for Digestion

The stomach is located predominantly on the left side of the upper abdomen. When you lie on your left side, gravity may help keep stomach contents lower and away from the esophagus.

For this reason, studies and clinical guidance commonly suggest left-side sleeping as a useful strategy for people with nighttime GERD symptoms.

Some people notice that changing from right-side sleeping to left-side sleeping reduces nighttime discomfort relatively quickly.

It's not a cure for GERD, though. Persistent reflux can have multiple causes, including obesity, certain foods, medications, hiatal hernia, smoking, and problems with the lower esophageal sphincter.

Your Sleeping Position Can Also Affect Breathing

Sleeping position doesn't only affect digestion.

For some people, side-sleeping can help keep the upper airway more open compared with sleeping flat on the back. This can be particularly relevant for people who snore or have obstructive sleep apnea.

When a person sleeps on their back, gravity can cause the tongue and soft tissues of the throat to move backward, potentially narrowing the airway.

Side-sleeping may reduce this effect.

That said, sleep position alone isn't enough to treat sleep apnea. If someone regularly snores loudly, wakes up choking or gasping, experiences witnessed pauses in breathing, or feels extremely sleepy during the day, they should speak with a healthcare professional.

What About Heart Health?

You'll often see claims online that sleeping on one particular side is dangerous for your heart. These claims are usually far more dramatic than the evidence supports.

For most healthy people, sleeping on either side is generally safe.

People with certain heart or lung conditions may have individual preferences or symptoms that make one position more comfortable than another. But there isn't a universal rule saying that healthy people must avoid sleeping on the right side because it will damage the heart.

If a particular sleeping position causes chest pain, shortness of breath, dizziness, or unusual palpitations, that's different. Those symptoms deserve medical attention rather than simply changing pillows or switching sides.

Pregnancy Is a Special Case

Sleeping position becomes particularly important during pregnancy.

As pregnancy progresses, many people find side-sleeping more comfortable. Healthcare professionals commonly recommend side sleeping, especially later in pregnancy, because lying flat on the back for prolonged periods can become uncomfortable and may affect major blood vessels as the uterus grows.

Pregnant people should follow individualized advice from their obstetrician or midwife, particularly if they have complications.

Does Right-Side Sleeping Have Any Benefits?

Absolutely.

The right side isn't a “bad” sleeping position.

Some people find right-side sleeping more comfortable because of their anatomy, shoulder position, breathing patterns, or personal habits. People without reflux may have no reason to avoid it.

In fact, constantly forcing yourself to sleep on the left side when it causes pain or prevents you from sleeping well isn't necessarily beneficial.

Sleep quality matters.

A position that allows you to remain asleep comfortably throughout the night may ultimately be better than obsessing over a supposedly perfect position.

Your Shoulder, Hip, and Spine Matter Too

Side-sleeping can sometimes create pressure on the shoulder and hip, particularly when the mattress is too firm or the pillow doesn't provide enough support.

Your neck should ideally remain in a relatively neutral position rather than bending sharply upward or downward.

A pillow between the knees can also help some side sleepers maintain a more comfortable hip and spinal position.

If you wake up with:

Neck stiffness → reconsider your pillow height.

Shoulder pain → avoid putting your full body weight directly on the painful shoulder.

Hip discomfort → try adjusting your mattress or placing a pillow between your knees.

Small adjustments can make a surprisingly big difference.

What If You Keep Waking Up With Heartburn?

Don't automatically blame your sleeping position.

Try looking at your entire nighttime routine.

Eating a large meal shortly before bed can increase the likelihood of reflux. Certain foods and drinks—including alcohol, high-fat meals, chocolate, caffeine, and spicy foods—can trigger symptoms in some individuals.

Other helpful strategies may include:

• Avoiding meals close to bedtime
• Identifying personal food triggers
• Maintaining a healthy weight if appropriate
• Elevating the head of the bed for nighttime reflux
• Limiting alcohol and tobacco
• Discussing persistent symptoms with a healthcare professional

Simply stacking several pillows under your head isn't always effective because it can bend the body at the waist. For some people with GERD, raising the upper portion of the bed is more helpful.

When Nighttime Symptoms Shouldn't Be Ignored

Occasional heartburn isn't unusual. But frequent or severe symptoms deserve attention.

Talk with a healthcare professional if you regularly experience nighttime reflux, difficulty swallowing, persistent vomiting, unexplained weight loss, anemia, or symptoms that are getting progressively worse.

And seek urgent medical attention for severe or unexplained chest pain, especially when it occurs with shortness of breath, sweating, nausea, fainting, or pain spreading to the arm, jaw, back, or shoulder.

Not every nighttime symptom is caused by digestion.

The Bottom Line

Your sleeping position can influence how your body feels during the night, particularly if you struggle with acid reflux, snoring, sleep apnea, pregnancy-related discomfort, or musculoskeletal pain.

For people with nighttime GERD, sleeping on the left side may reduce reflux compared with sleeping on the right side, partly because of the relationship between gravity and the position of the stomach.

But there's no reason to believe that sleeping on your right side is inherently dangerous for everyone.

The best sleeping position is ultimately one that supports comfortable, uninterrupted sleep while minimizing symptoms.

So if you frequently wake up with heartburn, coughing, or a sour taste in your mouth, try paying attention to which side you're sleeping on. Sometimes, a small change in nighttime positioning can make a noticeable difference—but persistent symptoms should never be dismissed as “just the way you sleep.”