Sleeping on your back is one of the best positions for spinal alignment, but most people don’t do it naturally. If you’re trying to make the switch, the key is setting up your body and bed correctly so the position feels comfortable enough to fall asleep in, then using a few simple tricks to stay there through the night.
Why Back Sleeping Is Worth the Effort
When you lie on your back, your body weight distributes evenly across the widest surface area of your spine. This neutral position keeps your head, neck, and torso aligned without the twisting or asymmetry that side and stomach sleeping create. Many people find it helpful for alleviating low-back pain, though the right pillow setup matters (more on that below).
Back sleeping also keeps your face off the pillow entirely. When you sleep on your side, the weight of your head presses your facial skin against the fabric, stretching muscles and compressing tissue in a way that, over years, contributes to permanent “sleep wrinkles.” People who sleep on their backs develop fewer of these compression lines because the gravitational force acts straight down through the back of the skull rather than crushing the cheeks and eye area.
Set Up Your Pillows Correctly
The pillow under your head is the single most important piece of equipment. You want a low to medium loft, which means roughly 5.5 inches or less for low, and 5.5 to 6.5 inches for medium. The goal is to fill the natural curve between your neck and the mattress without pushing your chin toward your chest. A pillow that’s too thick tilts your head forward and strains your neck. One that’s too flat lets your head drop backward.
Next, place a pillow under your knees. This is the detail most people skip, and it makes a dramatic difference in comfort. Slightly bending the knees takes tension off the lower back by allowing your lumbar spine to maintain its natural curve rather than flattening against the mattress. You don’t need anything fancy. A standard pillow or a small bolster works. If you still feel a gap between your lower back and the mattress, a thin pillow or rolled towel tucked underneath can fill that space.
Choose the Right Mattress Firmness
Back sleepers generally do best on a medium-firm mattress, around a 6 to 6.5 on the standard 1-to-10 firmness scale. This provides enough support to keep your hips from sinking too deep (which would arch your lower back uncomfortably) while still allowing a slight contour around your shoulders and torso.
Your weight shifts the ideal number. If you’re under 130 pounds, a medium firmness around 5 tends to be more comfortable because your lighter frame won’t sink as far. Between 130 and 230 pounds, aim for a 6. Over 230 pounds, a firmer 7 provides the extra support needed to keep the spine neutral. These are starting points, not rules. If your lower back aches in the morning, your mattress is likely too soft for your weight in this position.
How to Stay on Your Back All Night
Starting on your back is the easy part. Staying there once you’re asleep is the real challenge, especially if you’ve spent years as a side or stomach sleeper. Your body will try to roll into its familiar position within the first hour.
The most effective technique is building a pillow barrier. Place a pillow on each side of your midsection and hips. These don’t need to be stacked high. They just need to create enough resistance that when your sleeping body starts to turn, it meets an obstacle and settles back. Some people use a long body pillow on one side (whichever direction they tend to roll toward) and a regular pillow on the other.
Give yourself a transition period. You probably won’t sleep on your back for eight straight hours the first week. Start by falling asleep in the position each night, even if you wake up on your side. Over a few weeks, your body adapts and the pillow barriers become less necessary. Some people find it helpful to practice the position during short naps first to build familiarity without the pressure of needing a full night of sleep.
When Back Sleeping Isn’t a Good Idea
Back sleeping makes snoring and sleep apnea worse for most people. When you lie face-up, gravity pulls the soft palate and tongue backward, narrowing the airway at the throat level. For people with obstructive sleep apnea, breathing disruptions occur at roughly twice the frequency in the supine position compared to sleeping on the side. The increased airway collapsibility in this position is well-documented, particularly at the soft palate and epiglottis. If you snore heavily or have been diagnosed with sleep apnea, back sleeping is likely working against you.
Pregnancy is the other major exception. After 28 weeks of gestation, lying on your back allows the weight of the uterus to compress major blood vessels, reducing blood return to the heart and decreasing blood flow to the uterus. The standard recommendation is to go to sleep on your side (preferably the left side) from 28 weeks onward.
People with glaucoma should also be aware that intraocular pressure rises when moving from upright to any horizontal position. Studies on glaucoma patients show a mean pressure increase of 3.5 to 4.5 mm Hg when lying down. This isn’t unique to back sleeping (it happens in any lying-down position), but it’s worth discussing with an eye care provider if you have glaucoma or are at risk for it.
A Note on Acid Reflux
If you deal with heartburn or GERD, back sleeping is a middle-ground option. It’s better than sleeping on your right side, which tends to worsen reflux symptoms, but not as effective as sleeping on your left side, which keeps the stomach positioned below the esophageal opening. If you want to sleep on your back and manage reflux, elevating the head of your bed by a few inches (using a wedge pillow or bed risers, not just extra pillows) can help keep stomach acid where it belongs.