Training yourself to stop sleeping on your side takes most people one to three weeks of consistent effort, using a combination of pillow placement, physical barriers, and patience. Your body has spent years defaulting to a preferred position, so the key is making side sleeping less comfortable while making back sleeping feel more supported.
Why People Want to Switch
Most people searching for this are trying to sleep on their back instead. The reasons vary. Back sleeping distributes your weight more evenly across the widest surface of your body, which reduces pressure points on the shoulders and hips. It also keeps your face off the pillow, which matters more than most people realize. When you sleep on your side or stomach, your facial skin gets compressed and creased for hours at a time. Over years, those repeated compressions create permanent sleep wrinkles that no skincare routine can fully reverse. Sleeping on your back eliminates that mechanical force entirely.
Others switch because of shoulder pain, post-surgical recovery, or skincare treatments that shouldn’t be pressed into fabric overnight. Whatever your reason, the strategies are the same.
Set Up Your Bed for Back Sleeping
The biggest reason people roll onto their side at night is discomfort. If your back doesn’t feel supported, your body will shift to a position that does, usually within minutes of falling asleep. The fix starts with how you arrange your pillows.
Place a pillow or rolled towel under your knees. This is the single most important change you can make. When your legs are flat, your lower back arches away from the mattress, creating a gap that strains the lumbar spine. Bending your knees slightly with a support underneath tilts your pelvis into a more neutral position, flattening that gap and making back sleeping genuinely comfortable. A standard bed pillow works, though a small bolster pillow holds its shape better through the night.
Your head pillow matters too. Back sleepers need a lower, flatter pillow than side sleepers. Most people do well with a pillow between three and five inches thick. Anything higher pushes your chin toward your chest, which can feel suffocating and prompt you to roll sideways. A memory foam pillow holds its loft better than down or down-alternative, which compress under the weight of your head overnight and can leave your neck unsupported by morning.
Create Physical Barriers to Rolling
Even with perfect pillow placement, your unconscious body will try to return to its old position. You need something that makes rolling uncomfortable enough to stop you mid-turn without fully waking you up.
The simplest method is placing a pillow on each side of your torso, tucked snugly against your ribs and hips. These act as bumpers. When your body starts to rotate, it meets resistance and settles back. Some people use firm couch cushions or tightly rolled blankets for a sturdier barrier.
A more aggressive version is the tennis ball technique. Originally developed to keep sleep apnea patients off their backs, it works in reverse for your goal. Place tennis balls (or similar firm, round objects) into a pocket sewn onto the sides of a snug t-shirt, positioned around your mid-back and shoulder blade area. When you start rolling onto your side, the pressure from the ball creates enough discomfort to nudge you back without fully disrupting sleep. You can also place tennis balls inside socks and pin or tape them to the sides of your shirt if sewing isn’t practical.
Use a Wedge Pillow for Extra Stability
A wedge pillow elevates your upper body on a gradual incline, typically between 30 and 45 degrees depending on the height (most range from 6 to 12 inches). This slight elevation makes rolling to either side feel unnatural because your torso would have to slide downhill. Back sleepers generally prefer a lower incline, which feels more like sleeping flat while still providing that anti-roll stability.
Wedge pillows also help if you deal with acid reflux or sinus congestion, which are common complaints that drive people toward side sleeping in the first place. By addressing those issues in the back position, a wedge removes the incentive to roll over. A flat-style wedge works better than a curved one for this purpose, since it supports your full upper back rather than just your head and neck.
Build the Habit Gradually
You don’t need to succeed on night one. Start by falling asleep on your back every night, even if you wake up on your side. The goal in the first week is simply training your body to associate the back position with falling asleep. Over time, you’ll stay in that position longer before rolling.
Some people find it helpful to practice during the day first. Lie on your back on your bed with your knee pillow in place for 15 to 20 minutes while reading or watching something on your phone. This gets your body accustomed to the position without the pressure of needing to fall asleep. When bedtime comes, the setup feels familiar rather than foreign.
If you wake up on your side in the middle of the night, don’t get frustrated. Just reposition onto your back and resettle. Most people report that after two to three weeks of consistent effort, they wake up on their back more often than not. Full adaptation, where back sleeping becomes your default, can take four to six weeks.
When Back Sleeping May Not Be Right for You
Back sleeping isn’t ideal for everyone. If you snore heavily or have obstructive sleep apnea, lying face-up can make it worse. Roughly 50 to 75 percent of people with sleep apnea experience more breathing disruptions in the back position than on their side, because gravity pulls the tongue and soft tissues backward into the airway. If you’ve been told you snore or if you wake up gasping, talk to a sleep specialist before committing to back sleeping.
Pregnant people in the second and third trimesters are also better off on their side, since back sleeping can compress major blood vessels and reduce blood flow to the uterus. And if you have certain types of lower back conditions where extension (arching backward) increases pain, back sleeping might aggravate symptoms even with a knee pillow. In these cases, optimizing your side sleeping posture with a pillow between the knees to keep your hips stacked and your spine aligned is a better strategy than fighting your way onto your back.