Training yourself to sleep on your back takes most people one to three weeks of consistent effort, and the key is making every other position less comfortable while making the supine position feel better. Your body naturally shifts positions dozens of times per night, so the goal isn’t to stay perfectly still. It’s to make back sleeping your default starting position and the one you return to most often.
Why Your Body Resists It
If you’ve spent years as a side or stomach sleeper, your muscles, joints, and even your mattress have adapted to that position. Lying flat on your back can feel oddly exposed and unsupported at first, especially in the lower back, where a gap forms between your spine and the mattress. That discomfort is the main reason people roll over within minutes of trying. The fix isn’t willpower. It’s physical support and strategic barriers.
Set Up Your Pillows Correctly
The single most important adjustment is placing a pillow under your knees. The Mayo Clinic recommends this specifically because it relaxes your back muscles and preserves the natural curve of your lower spine. Without it, your lower back flattens against the mattress and creates tension that builds over hours. If you still feel a gap at your waist, a small rolled towel tucked underneath adds extra support.
Your head pillow matters too. Back sleepers need a medium-loft pillow, generally 3 to 6 inches thick, to keep the neck in a neutral position. Too flat and your head tilts backward, straining your neck. Too thick and your chin gets pushed toward your chest, which can restrict your airway. The right height keeps your ears roughly aligned with your shoulders, as if you were standing with good posture.
Block Yourself From Rolling Over
Pillows on either side of your torso act as bumpers. Place a firm pillow or rolled blanket snugly along each side of your body, from your ribs to your hips. When you unconsciously try to turn, you’ll meet resistance and settle back. Some people use a long body pillow shaped into a U around their upper body for the same effect.
You may have heard of the tennis ball technique, where you attach a tennis ball to the back of your pajama top to prevent supine sleeping (typically used for snoring). The logic works in reverse too: sewing or taping tennis balls to the front and sides of a snug shirt makes rolling onto your stomach or side uncomfortable. That said, research on the traditional tennis ball method found that fewer than 10 percent of people stuck with it after two years because the ball shifted around, caused backaches, or just felt too disruptive. If you try a version of this, a more stable option is a small backpack or fanny pack worn on your front, stuffed with socks.
A Gradual Nightly Routine
Don’t expect to flip a switch. Start by lying on your back for the first 15 to 20 minutes of the night while you fall asleep. This is the position your body learns to associate with sleep onset, and it’s the one you’ll default to when you wake briefly during the night. If you wake up on your side at 3 a.m., gently reposition yourself and don’t stress about it. Consistency at the start of the night matters more than perfection throughout.
During the first week, you’ll likely wake up in a different position most mornings. By the second or third week, many people find they’re waking on their back at least some of the time. The transition period often involves lighter sleep, so starting on a weekend or a low-stress week helps.
Benefits Worth the Effort
Back sleeping distributes your weight evenly across your widest surface area, which reduces pressure points on your shoulders and hips. It also keeps your head, neck, and spine in a neutral line without the twisting that side and stomach sleeping create.
For your skin, the difference is straightforward. When you sleep face-down or on your side, gravity presses your face into the pillow, compressing and stretching the skin for hours at a time. Over years, this repetitive distortion contributes to sleep wrinkles, distinct from expression lines, that form along the cheek, chin, and forehead. Sleeping on your back eliminates that contact entirely. The same logic applies to acne: less pillowcase contact means less transfer of oils and bacteria to your face.
If you deal with acid reflux, back sleeping pairs well with a wedge pillow that elevates your head 6 to 12 inches at a 30- to 45-degree angle. This uses gravity to keep stomach acid from traveling up the esophagus, which a flat pillow can’t do.
When Back Sleeping Isn’t Safe
Two groups should avoid training themselves to sleep on their back.
People with obstructive sleep apnea often breathe significantly worse in the supine position. Lying face-up causes the base of the tongue to fall backward, narrowing the airway. It also reduces lung volume, making the airway more likely to collapse. For people with positional sleep apnea, breathing interruptions can roughly double when sleeping on the back compared to the side. If you snore heavily or have been diagnosed with sleep apnea, back sleeping could make things worse rather than better.
Pregnant women in the third trimester should not sleep on their back. A New Zealand case-control study found that going to sleep in the supine position after 28 weeks of gestation was associated with a 3.7 times higher risk of late stillbirth. The risk was even greater after 37 weeks. The weight of the uterus compresses major blood vessels, reducing blood flow to the placenta. Side sleeping, particularly on the left, is the recommended position in late pregnancy.
Helpful Equipment
- Knee pillow or bolster: A firm, cylindrical pillow stays in place better than a standard pillow, which tends to flatten or shift by morning.
- Contoured back-sleeper pillow: These have a slight cradle shape that discourages your head from turning to the side.
- Wedge pillow: Useful if you have reflux or sinus congestion. The gentle incline also makes the position feel less vulnerable for people who find flat-on-your-back sleeping psychologically uncomfortable.
- Positional sleep belt: Wearable devices designed to vibrate gently when you roll off your back. Originally made for sleep apnea patients avoiding the supine position, some models can be set to the opposite goal.
The mattress itself plays a role. A medium-firm surface works best for back sleepers because it supports the natural spinal curve without letting the hips sink too deep. A very soft mattress creates a hammock effect that curves the spine unnaturally and makes back sleeping less comfortable than it should be.