Sleeping without a pillow is only good for your back in one specific scenario: if you sleep on your stomach. For back sleepers and side sleepers, removing the pillow typically makes spinal alignment worse, not better. The answer depends almost entirely on your sleep position and, to a lesser extent, your body proportions.
The goal during sleep is to keep your spine in roughly the same alignment it has when you’re standing with good posture. In the supine (face-up) position, that means preserving the natural S-curve. In the side position, it means keeping your spine horizontal so your head isn’t tilting toward or away from the mattress. A pillow’s job is to fill the gap between your head and the sleeping surface so your neck doesn’t have to bend to reach it.
Why Stomach Sleepers May Benefit
Stomach sleeping already puts your spine in a tough position. Your head has to turn to one side so you can breathe, which stretches and rotates your neck. Stacking a pillow underneath pushes your head even higher, increasing the backward arch in your cervical spine and adding strain to the joints and muscles in your neck.
Removing the pillow in this position lets your head sit closer to the mattress, which can reduce that exaggerated arch and keep your neck and spine in a somewhat more neutral line. The American Chiropractic Association’s sleep ergonomics guidance says stomach sleepers should try sleeping without a head pillow if using one causes back strain. They also recommend placing a separate pillow under the pelvis and lower abdomen to reduce the forward curve in the lower back, which is the main source of lumbar discomfort for stomach sleepers.
That said, stomach sleeping itself is considered the least back-friendly position overall. If you can gradually shift to your back or side, that’s a bigger win for spinal health than any pillow adjustment.
Side Sleepers Need a Pillow
When you lie on your side, your shoulder creates a significant gap between the mattress and your head. Without a pillow filling that space, your head drops toward the bed, bending your neck laterally and pulling your upper spine out of alignment. This is the opposite of what you want. Over time, that nightly misalignment can lead to neck stiffness, tension headaches, and upper back pain.
The ideal pillow for side sleeping is one thick enough to keep your head level with your spine, so your neck stays roughly straight rather than angling down. Research on ergonomic pillow height suggests that the lateral (side) position generally requires a taller pillow than back sleeping, with one study identifying 10 centimeters (about 4 inches) as the most comfortable height for side sleepers. The exact number varies by shoulder width and mattress firmness, but the principle holds: your pillow should be high enough that your nose lines up with the center of your chest.
The Mayo Clinic also recommends that side sleepers place a pillow between their knees. This keeps the hips, pelvis, and lumbar spine aligned and takes pressure off the lower back, a detail that matters more for back pain than the head pillow alone.
Back Sleepers: Low, Not Gone
If you sleep on your back, the gap between your head and the mattress is smaller than it is for side sleepers, but it still exists. Your neck has a natural forward curve (cervical lordosis) that needs support. A pillow that’s too high pushes your chin toward your chest, straining the back of the neck. No pillow at all lets your head fall backward, flattening or reversing that curve and putting stress on the cervical joints.
Research on optimal pillow height for back sleepers ranges from about 7 to 10 centimeters, depending on the study and individual anatomy, but scientists acknowledge there’s no single universal number. What’s consistent across the literature is that the pillow should be raised in the neck region to cradle the cervical spine rather than just cushioning the back of the skull. A pillow that’s too flat can be just as problematic as one that’s too tall.
For lower back pain specifically, the pillow under your head matters less than what you put under your knees. Placing a pillow beneath the knees while lying on your back helps relax the lumbar muscles and maintain the natural curve of the lower spine. If you’ve been waking up with a stiff lower back, that small addition often makes a noticeable difference.
What Actually Helps Back Pain During Sleep
Pillow choice is one piece of a larger picture. The mattress, your sleep position, and how you support your limbs all interact. A few principles hold true regardless of position:
- Match pillow height to your position. Side sleepers need the most loft, back sleepers need moderate loft, and stomach sleepers need very little or none.
- Support the curves, not just the head. A pillow between the knees (side sleepers), under the knees (back sleepers), or under the hips (stomach sleepers) does more for lower back pain than the head pillow.
- Firmness matters as much as height. A pillow that compresses completely under the weight of your head offers the same alignment problems as no pillow at all. One that’s too firm can push your head out of alignment in the other direction.
Pillow height recommendations also differ between men and women, largely because of differences in shoulder width and head size. A pillow that works perfectly for one person can cause problems for their partner. If you share a bed, using separate pillows matched to each person’s build and sleep position is a simple fix that often gets overlooked.
How to Transition if You Want to Try It
If you’re a stomach sleeper and want to test going pillowless, don’t just yank the pillow out and hope for the best. Your muscles and joints have adapted to your current setup, and a sudden change can leave you with a sore neck even if the new position is theoretically better.
Start by switching to a thinner pillow or folding a towel to a low height for a week or two. Gradually reduce the thickness until you’re sleeping flat. Pay attention to how your neck and back feel in the morning. Some soreness in the first few days is normal as your body adjusts, but pain that persists beyond a week or gets worse suggests the change isn’t right for you. Adding a pillow under your hips during this transition can help keep your lower back from arching too deeply into the mattress.
For back sleepers who suspect their pillow is too high, the same gradual approach works. Try a lower-loft pillow rather than eliminating it entirely. The goal is finding the height where your neck feels supported without being pushed forward or allowed to drop back.