Sleeping on your back is one of the best positions for spinal alignment and joint health, but it’s not ideal for everyone. If you snore, have sleep apnea, or are in late pregnancy, back sleeping can actually make things worse. The “best” sleep position depends on what your body needs.
Why Back Sleeping Is Good for Your Spine
When you lie on your back, your weight distributes evenly across the widest surface of your body. This takes pressure off your spine and joints, which is why back sleepers often wake up with less neck, back, and hip pain. Unlike side or stomach sleeping, the supine position avoids pushing your spine into a sideways curve or forcing your neck into rotation.
You can improve this alignment further by placing a small pillow under your knees. This supports your spine’s natural curve and reduces strain on the lower back, which tends to flatten against the mattress otherwise. Larger or heavier people generally benefit from a thicker, firmer knee pillow, while lighter individuals do fine with something thinner and softer.
It Can Help Prevent Wrinkles
This one surprises people, but it’s real. When you sleep on your side or stomach, your face presses into the pillow for hours. That compression, shearing, and distortion of facial skin creates “sleep lines” over time. These aren’t expression lines from smiling or squinting. They’re mechanical wrinkles caused by repeated pressure, and they become more pronounced as your skin loses collagen and elasticity with age.
Sleeping on your back keeps your face free from contact with the pillow entirely, which is why dermatologists and plastic surgeons consistently recommend it for minimizing these kinds of wrinkles.
The Snoring and Sleep Apnea Problem
Back sleeping has a significant downside: it makes snoring and obstructive sleep apnea worse, sometimes dramatically. When you lie face-up, gravity pulls the base of your tongue backward, narrowing your airway. Your lung volume also decreases in this position, which increases the likelihood that your upper airway will collapse during breathing.
The effects go beyond louder snoring. Breathing pauses become more frequent on your back, and each pause tends to last longer, cause a greater drop in blood oxygen, and produce more severe heart rate fluctuations compared to side sleeping. One study found that simply avoiding the supine position cut total snoring rates by more than 60%.
If you snore heavily or have been diagnosed with sleep apnea, side sleeping is almost certainly a better choice. For people without these issues, back sleeping doesn’t pose the same airway risk.
Acid Reflux Clears Slower on Your Back
If you deal with nighttime heartburn, back sleeping isn’t your best option. A study monitoring 57 people with chronic heartburn found that stomach acid backed up into the esophagus at roughly the same rate regardless of sleep position. The key difference was how quickly that acid cleared: it resolved much faster when people slept on their left side compared to sleeping on their back or right side.
So while lying on your back won’t necessarily cause more reflux episodes, the burning sensation lingers longer because gravity isn’t helping move the acid back down as effectively.
Back Sleeping During Pregnancy
In the third trimester, sleeping on your back raises concerns because the weight of the uterus can compress major blood vessels, potentially reducing blood flow to both you and the baby. A British study linked back sleeping in late pregnancy to an increased risk of stillbirth, though experts at the University of Utah Health note the data isn’t strong enough to say back sleeping directly causes this outcome. The link may have more to do with sleep apnea, which becomes more common in the third trimester and worsens in the supine position.
That said, the stress of forcing yourself into an unnatural sleep position all night may do more harm than good. If you fall asleep on your side and wake up on your back, that’s generally not cause for alarm. Most guidance for late pregnancy simply encourages starting the night on your left side rather than maintaining rigid position control.
What About Eye Pressure?
Lying down in any position raises the pressure inside your eyes compared to sitting upright. For most people, this is meaningless. But if you have glaucoma or are at risk for it, sleep position becomes more relevant. Research on healthy young adults found that eye pressure increased in all recumbent positions, though sleeping on your side actually produced higher pressure in the lower eye than back sleeping did. If glaucoma is a concern for you, this is worth discussing with your eye doctor, but back sleeping isn’t the worst option here.
How to Make Back Sleeping More Comfortable
Most people don’t naturally sleep on their backs. Only about 8% of adults prefer the supine position. If you want to try it, a few adjustments help. Use a pillow that supports the curve of your neck without pushing your head too far forward. A pillow that’s too thick angles your chin toward your chest, straining your neck. Back sleepers generally need a thinner pillow than side sleepers do.
Place a pillow under your knees to prevent your lower back from arching away from the mattress. Some people also tuck small rolled towels along their sides to discourage rolling over during the night. Give yourself a few weeks to adjust, as changing a lifelong sleep habit doesn’t happen overnight.
Who Should and Shouldn’t Sleep on Their Back
- Good candidates: People with back, neck, or hip pain who want better spinal alignment. People concerned about facial wrinkles from pillow compression. Anyone without snoring or breathing issues during sleep.
- Better off on their side: People who snore or have obstructive sleep apnea. People with frequent acid reflux or nighttime heartburn (left side specifically). People in the third trimester of pregnancy.
Back sleeping offers real advantages for spinal health and skin, but those benefits only matter if you’re actually sleeping well. If switching to your back leaves you snoring, tossing, or staring at the ceiling, the position that lets you fall asleep and stay asleep is the one that’s truly best for you.