Stiff Neck From Sleeping: Why It Happens and What Helps

A stiff neck after sleeping usually means your neck stayed bent or twisted for hours, and pillow height is one of the easiest causes to look at. It is rarely the only cause, so the fix often involves position, mattress and your own health history as well.

Key takeaways

• A pillow that is too high or too low for your body leaves the neck tilted for hours. The right height depends on shoulder width, neck size, sleeping position and mattress firmness.
• A pillow is one factor among several. Stress, daytime posture, an earlier neck injury and the mattress also matter, and a pillow will not fix every stiff neck.
• Stiffness that keeps returning, gets worse, or comes with numbness, weakness or arm symptoms needs a visit to your own chiropractor, physical therapist or physician. A free Pillowise measurement at a provider near you is a practical next step for the pillow part.

Why do I wake up with a stiff neck?

During sleep you hold one posture for a long stretch. If that posture asks the neck muscles to work, or loads the joints at the end of their range, you feel it when you get up. Typical culprits are:

• Pillow height that does not match your body. The pillow has to fill the gap between your head and the mattress. If it does not, the neck bends toward or away from the mattress all night.
• Sleeping position. Stomach sleeping keeps the head turned to one side for hours. Side and back sleeping can be easier on the neck, but only if the pillow height is right.
• Mattress firmness. On a soft mattress, including many memory foam and hybrid models, the shoulders sink deeper. That changes how much space the pillow needs to fill.
• Everything else. Long hours at a desk, stress, a recent workout or an old neck injury can all make the neck less tolerant of a night in a poor position.

We are not able to say which of these caused your stiffness from a description alone. That takes an assessment by a licensed provider.

How does pillow height change the position of my neck?

Think of a shoe size. A shoe that is too small or too large still works, but it changes how you move. A pillow works the same way. One stock height cannot suit every shoulder width and neck.

For side sleepers, shoulder width is a large part of the picture, because the shoulder sets how far the head sits above the mattress. We cover that in side sleeping, shoulder width and pillow height. Studies on pillow height and neck pain are summarized in adjusting pillow height for neck pain: clinical studies. Many of those studies are small, so treat them as supporting evidence and not as proof that a pillow resolves neck pain.

How can I tell if my pillow is the problem?

A few signs point toward the pillow:

• The stiffness is worst first thing in the morning and eases during the day.
• You change pillows, hotels or beds and the stiffness changes too.
• You fold, stack or punch your pillow into shape during the night.
• You wake up with your head pushed off the pillow or sunk below it.

Our post on how to tell if your pillow is the wrong height goes through these signs in more detail.

What can I do about a stiff neck this week?

1. Move gently. Light movement within a comfortable range is usually easier on a stiff neck than staying still. Do not force a stretch through sharp pain.
2. Notice how you fall asleep. The position you fall asleep in is the one a pillow should be fitted for. If you often wake up on your stomach, a provider can talk through that with you.
3. Check the gap. Lie in your usual position and have someone look at you from the front or back. Your head and neck should sit in a fairly straight line with the rest of your spine, not tilted up or down.
4. Look at the mattress. If you do not know how firm it is, call it medium. A very soft mattress changes how deep your shoulders sink.
5. Get measured. Guessing at height by trying pillows one after another is slow and hard to judge. A measurement gives you a starting point. For related reading on mornings, see strategies for improving morning stiffness.

When will a pillow not help, and when should I see a provider?

A pillow does not treat a neck condition. It is a support for the hours you spend asleep, and it works best as an adjunct to care. See your own chiropractor, physical therapist or physician if:

• the stiffness keeps coming back or is getting worse,
• you have numbness, tingling or weakness in your arms or hands,
• the stiffness followed a fall, accident or other injury,
• you have a severe headache, fever or other symptoms that worry you.

Sleep itself can also affect how neck pain feels. We wrote about that in does poor sleep make neck and back pain worse?

How does Pillowise approach pillow fit?

A Pillowise fitting uses three measurements:

• shoulder width,
• neck circumference (at C4/C5),
• neck height (from the mastoid process diagonally to the outer edge of the acromion).

It adds your preferred sleeping position (side, back or stomach) and your mattress firmness (soft, medium or firm). The Pillowise algorithm combines these five factors and picks one of 7 sizes. The system indicates the right size for about 95% of people. Weight is not part of the calculation. A heavier person sinks deeper into the mattress and may need a lower pillow, so the provider checks your position on the pillow and adjusts if needed, for example during pregnancy.

The core is premium Dutch memory foam, made in the Netherlands. The cover is removable and machine washable at 104°F. If the first size does not feel right, give it 7 to 10 days to adjust. Within 30 days of purchase you can exchange it for another size or return it for a refund. Return shipping is paid by you, and shipping charges are not refunded. You can also try our pillow height calculator, and our guide to choosing a pillow by sleep position and mattress explains how position and mattress affect the choice. The questions we hear most are in our FAQ.

Find a provider near you

Pillowise is sold only through licensed chiropractors, physical therapists and massage therapists. It is not sold in retail stores or on Amazon. The measurement is free at every provider, and the provider can also talk with you about your stiff neck. If you are considering paying with an FSA or HSA, ask your plan administrator whether it applies to you.

Find a Pillowise provider near you for a free measurement.

Are you a chiropractor, PT or LMT? Learn how to offer Pillowise in your practice.

Thijs van der Hilst, physiotherapist
Co-founder of Pillowise