Pillow Too Low? How to Tell and What to Do

A pillow is too low when it leaves a gap between your head and the mattress, or lets your head tip back, so your neck stays bent for hours instead of in line with your spine. How low is too low depends on your shoulder width, neck, sleeping position and mattress, not on one standard height.

Key takeaways

• Side sleepers with wide shoulders and people on firm mattresses most often outgrow a low pillow, because the gap between head and mattress is larger.
• Height is relative to your body: a pillow that is too low for a side sleeper can be about right for a stomach sleeper.
• A fitting uses three measurements plus sleeping position and mattress firmness. The measurement at a Pillowise provider is free.

How do I know my pillow is too low?

On your side, your head tilts down toward the mattress. On your back, your chin lifts and your head tips back. Waking with neck or shoulder stiffness is a common sign, but many things cause it. Our post on how to tell if your pillow is the wrong height has the full checklist.

Why does a pillow end up too low?

• Shoulder width. On your side, the shoulder is the widest point between head and mattress. The wider it is, the more height the pillow must fill. A small pilot EMG study in adults linked a pillow height matched to shoulder width with lower neck and shoulder muscle activity (Jiao et al., 2025). We cover it in side sleeping, shoulder width and pillow height.
• Mattress firmness. On a firm mattress your shoulder sinks less, so you need more pillow. On a soft or memory foam mattress you sink deeper and usually need less.
• Worn filling. Soft or old fill can flatten overnight.

What can I try at home?

1. Check your position. Lie down the way you fall asleep. Have someone look from the side to see whether your neck bends toward the mattress or back.
2. Add height under the pillow. A folded towel under the pillow, not under your shoulders, shows whether more height feels better.
3. Allow several nights. Your body needs time to adjust before you judge a change.

This is a rough test. It does not replace a measurement.

How does Pillowise approach pillow height?

We treat height like shoe size. A provider measures your shoulder width, neck circumference and neck height. We add your sleeping position and mattress firmness, and the Pillowise algorithm picks one of 7 sizes. Two people with very different bodies can end up with the same size, because five factors are combined. You can read the steps in what happens in a pillow fitting. If the pillow doesn't suit you, the 30-day comfort guarantee lets you exchange or return it after you have given it 7 to 10 days.

When is the pillow not the problem?

A fitted pillow is an adjunct to care, not a treatment. If you have ongoing pain, numbness or tingling in your arms, or pain after an injury, see your own provider first.

Find a provider near you

Pillowise is sold only through licensed chiropractors, physical therapists and massage therapists. Use our provider finder to book a free measurement near you. You can also try the manual measurement in the pillow height calculator.

Are you a chiropractor, PT or LMT? Register as a Pillowise provider.

Thijs van der Hilst, physiotherapist
Co-founder of Pillowise