Training yourself to sleep on your back takes most people two to four weeks of consistent effort. The challenge isn’t complicated, but it requires patience: your body has spent years defaulting to its preferred position, and overriding that habit means using physical cues, proper support, and a bit of stubbornness. The good news is that a few simple setup changes can make the supine position comfortable enough that your body stops fighting it.
Why Back Sleeping Is Worth the Effort
Sleeping face-up 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 often introduce.
There are skin benefits too. When you sleep on your side or stomach, gravity presses your face into the pillow, stretching, compressing, and pulling your skin in multiple directions throughout the night. Over time, these repeated mechanical forces create sleep wrinkles that become permanent creases. Back sleeping eliminates that contact entirely. The rate of wrinkle formation depends on how long your face stays pressed against a surface and how much force is applied, so even partial back sleeping reduces the cumulative damage.
Set Up Your Pillows Correctly
The number one reason people abandon back sleeping is discomfort, and discomfort usually comes from poor pillow placement. You need support in three key areas.
Under your knees: Place a pillow or bolster under your knees. This relaxes your lower back muscles and preserves the natural curve of your lumbar spine. Without it, your legs pull your pelvis forward and create a gap between your lower back and the mattress that leads to stiffness by morning.
Under your neck: Your pillow should keep your neck aligned with your chest and upper back, not push your head forward or let it fall backward. A pillow that’s too thick angles your chin toward your chest. One that’s too flat lets your head drop, straining the back of your neck. For most people, a medium-loft pillow (roughly three to five inches) works well. Memory foam or contoured pillows that cradle the natural cervical curve can help if a standard pillow feels unsupportive.
Under your lower back (optional): If you still feel a gap between your lower back and the mattress, a small rolled towel placed at your waistline fills that space and prevents your spine from flattening unnaturally.
Use Physical Barriers to Prevent Rolling
Most people roll onto their side within minutes of falling asleep without realizing it. Physical barriers train your body to associate side-rolling with mild discomfort, which gradually resets your default position.
The simplest method is placing pillows on either side of your torso. Firm couch cushions or rolled-up blankets work even better because they don’t compress as easily when you lean into them. Position them snugly against your ribcage and hips so that turning onto your side requires conscious effort.
A more aggressive option borrows from a technique used in sleep medicine. The “tennis ball technique” involves attaching tennis balls to your sides (rather than your back, since your goal is the opposite of the clinical version). You can place tennis balls in the pockets of a loose shirt or sew them into a sleep belt. In clinical applications, a validated version of this approach reduced time spent in the unwanted position from about 43% of the night down to 8%. The principle is the same regardless of which position you’re trying to avoid: mild discomfort creates a subconscious cue to reposition.
Backpack-style devices are another option. Wearing a mostly empty backpack or fanny pack shifted to your side makes rolling uncomfortable enough to keep you supine without fully waking you.
A Gradual Training Schedule
Going cold turkey often backfires because poor sleep quality makes you give up. A phased approach works better.
Week one: Start on your back each night with your pillow setup in place. Don’t worry if you wake up on your side. The goal is simply to begin each sleep cycle in the supine position. Practice during naps or quiet rest periods too, so your body builds familiarity with the position while you’re semi-conscious.
Week two: Add your physical barriers. Pillows flanking your torso, a bolster under your knees, and side barriers should all be in place. When you wake up and find yourself on your side, consciously roll back and resettle. This middle phase is where most of the habit formation happens.
Weeks three and four: By now, you should notice that you’re waking up on your back more often. Start removing one barrier at a time. Drop the side pillows first, then see if you maintain the position without them. Keep the knee pillow indefinitely since it serves a comfort function, not just a training one.
Some people adapt in ten days. Others need six weeks. If you’re a lifelong stomach sleeper, expect the longer end of that range.
Choose the Right Mattress Firmness
Back sleepers generally do best on a medium-firm mattress, around 6 to 7 on a 10-point firmness scale. This provides enough support to keep your spine from sagging while allowing slight contouring at the shoulders and hips. Your weight matters here: if you’re under 130 pounds, a medium mattress (around 5 on the scale) prevents you from feeling like you’re sleeping on a board. If you’re over 230 pounds, a firmer surface (around 7) keeps you from sinking too deeply, which would misalign your spine.
You don’t necessarily need a new mattress. A firm mattress topper can shift a too-soft bed into the right range, and it’s a much cheaper experiment.
When Back Sleeping Isn’t a Good Idea
Back sleeping worsens obstructive sleep apnea. In the supine position, gravity pulls the tongue and soft tissues toward the back of the throat, narrowing the airway. A systematic review found that the number of breathing disruptions per hour is roughly twice as high when sleeping on the back compared to sleeping on the side. For people with mild sleep apnea, simply avoiding the supine position can be enough to manage symptoms without other treatment. If you snore heavily or have been told you stop breathing during sleep, back sleeping could make things worse.
Acid reflux is another consideration. Sleeping on the left side results in significantly less acid exposure and faster acid clearance compared to both the supine and right-side positions. One study found 80 reflux episodes per night in left-side sleepers versus 102 in supine sleepers. If you deal with nighttime heartburn, left-side sleeping is a better choice. Elevating the head of your bed can partially offset reflux in the supine position, but it doesn’t match the benefit of left-side sleeping.
Pregnant women should avoid back sleeping after 28 weeks of pregnancy. High-quality evidence from a pooled analysis of over 3,000 women found that going to sleep on the back after 28 weeks was associated with roughly 2.6 times the risk of stillbirth compared to falling asleep on the left side. The risk for the baby being born small for gestational age was even higher, at about 3.2 times. Current guidelines from NICE recommend that women try to fall asleep on their side after 28 weeks. If you wake up on your back, simply roll over and don’t panic. The guidance is about your position when you fall asleep, which is the position you spend the most time in.
Small Adjustments That Help
Sleeping on your back can feel vulnerable or exposed at first. A weighted blanket (typically 10 to 15 percent of your body weight) provides gentle compression that mimics the “cocooned” feeling side sleepers are used to. This can ease the psychological discomfort of lying face-up.
Temperature matters more on your back because more of your body surface contacts the mattress. If you tend to sleep hot, a breathable mattress cover or cooling pillow can prevent the overheating that drives you to roll onto your side, where airflow is better.
Finally, pay attention to your arms. Letting them rest at your sides or across your stomach is fine, but placing them above your head can strain your shoulders over time. A slight bend at the elbows with your hands resting on your lower chest or abdomen is the most sustainable position for most people.