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 feel less comfortable than lying supine. Your body has spent years defaulting to its current sleep position, so the transition requires both physical setup changes and a few behavioral tricks to keep you from rolling over once you fall asleep.
Why Back Sleeping Is Worth the Effort
Sleeping on your back distributes your body weight evenly across the widest surface area, which reduces pressure points on your shoulders, hips, and joints. A 2025 systematic review of six studies found that the supine position supports spinal alignment and is associated with lower rates of low back pain, while stomach sleeping increases back pain risk due to excess lumbar strain. Back sleeping also keeps your face off the pillow, which over time can reduce sleep wrinkles and help skincare products absorb overnight instead of transferring to your pillowcase.
Set Up Your Bed for Supine Sleep
The right pillow and mattress do most of the work. Back sleepers need a medium-loft, medium-firm pillow that fills the natural curve between your neck and the mattress without pushing your chin toward your chest. If the pillow is too thick, your head tilts forward and strains your neck. Too flat, and your head drops back, which can worsen snoring. The sweet spot keeps your ears aligned directly over your shoulders.
Place a second pillow (or a rolled towel) under your knees. Keeping your knees slightly bent rather than fully straight reduces strain on your lower back and encourages a more relaxed alignment of your spine, hips, and pelvis. This small change often makes the difference between waking up with a stiff back and waking up comfortable. A bolster pillow works well here because it stays in place better than a standard pillow.
For your mattress, back sleepers generally need something on the firmer side to keep the pelvis aligned with the spine. On a 1 to 10 firmness scale, most back sleepers do well between 5 and 7. A mattress that’s too soft lets your hips sink, creating an exaggerated curve in your lower back that leads to morning soreness.
The Pillow Barrier Method
The simplest way to stop yourself from rolling onto your side is to build a physical barrier. Place a firm pillow on each side of your torso, tucked snugly against your ribs. When your body tries to turn during sleep, it meets resistance and stays put. Some people also tuck a pillow or rolled blanket under each arm, which mimics the “hugging” sensation that side sleepers often crave.
Travel pillows offer another option. Wearing a U-shaped neck pillow backward (with the opening at the back of your neck) cradles your head and makes turning uncomfortable enough that your sleeping brain gives up trying. This works especially well during the first week when the habit hasn’t set yet.
The Tennis Ball Technique (Reversed)
You may have heard of sewing a tennis ball into the back of a shirt to stop someone from sleeping on their back. The same principle works in reverse. Attach tennis balls, small inflatable pouches, or lumps of firm foam to the sides of a snug shirt, roughly at chest level. When you roll onto your side, the discomfort nudges you back. Commercially available bands use inflatable airbags positioned with an elastic strap around the chest to achieve the same effect, and they’re easier to adjust than a DIY setup.
A Nightly Routine That Helps
Start every night on your back, even if you don’t fall asleep that way at first. Your body learns position habits through repetition, and the more minutes you spend supine before drifting off, the longer you’ll stay there. A few specific steps help:
- Stretch before bed. Tight hip flexors and chest muscles pull your body into a curled position. A 60-second hip flexor stretch on each side and a doorway chest stretch open up the front of your body, making it easier to lie flat comfortably.
- Use a weighted blanket. The gentle, distributed pressure across your torso reduces the urge to shift positions and creates a sense of security that side sleepers typically get from curling up.
- Relax systematically. Once you’re on your back with your knee pillow in place, do a slow body scan from your feet upward, consciously releasing tension in each muscle group. This gives your mind something to focus on besides the unfamiliar position.
- Keep your arms comfortable. Let them rest at your sides with palms up, or place your hands on your stomach. Arms overhead can cause shoulder tingling and make the position harder to maintain.
If you wake up on your side during the night, don’t get frustrated. Just roll back and resettle. Most people find that they stay on their back for progressively longer stretches over the first two weeks.
When Back Sleeping Isn’t Ideal
Back sleeping can make snoring and sleep apnea significantly worse. In people with obstructive sleep apnea, gravity pulls the tongue and soft tissues toward the airway when lying face up. One clinical case study measured an apnea-hypopnea index (a count of breathing disruptions per hour) of 15.1 while supine compared to zero while sleeping on the side. If you snore heavily or have been told you stop breathing during sleep, talk to a sleep specialist before committing to back sleeping.
Acid reflux is another consideration. A study of 57 people with chronic heartburn found that while the number of reflux episodes was similar across positions, acid cleared from the esophagus much faster when participants slept on their left side compared to their back or right side. If you deal with nighttime heartburn but still want to sleep on your back, a wedge pillow that elevates your upper body by about six inches can help compensate.
Pregnant people should avoid back sleeping starting at 28 weeks of gestation. Before that point, evidence shows sleeping posture does not affect pregnancy outcomes. After 28 weeks, the weight of the uterus can compress a major blood vessel when lying supine, potentially reducing blood flow to the baby.
What to Expect During the Transition
The first few nights are the hardest. You’ll likely fall asleep on your back but wake up on your side, and that’s normal. Your unconscious movement patterns take time to rewire. By the end of the first week, most people notice they’re waking up on their back at least part of the night. By week two or three, the position starts to feel natural rather than forced.
Some people experience temporary lower back discomfort during the first few days, especially if their mattress is too soft or they skip the knee pillow. If your back aches in the morning, try a thicker bolster under your knees or fold a towel and place it in the small of your back to support your lumbar curve. These small adjustments usually resolve the issue within a night or two.