Something strange happens when you get into a hotel bed or stay with friends: your own familiar way of lying suddenly no longer feels right, even though you’ve brought the same head with you. The culprit lies beneath you: the mattress. Pillow and mattress together form a single system, and if you change one, you secretly change the other. How exactly this works, and when you should reconsider your pillow height, you can read here.
The short answer
Does your mattress affect your pillow height? Yes, directly. On a soft mattress, your shoulder sinks a few centimeters, reducing the space between your head and the mattress, so a lower pillow is sufficient. On a firm mattress, your shoulder remains high, and the pillow needs to fill more space. Rule of thumb for side sleepers: firm mattress, higher pillow; soft mattress, lower pillow. If you buy a new mattress, also check your pillow height.
Why does your mattress determine how high your pillow should be?
For a side sleeper, everything revolves around one distance: the space between your ear and the mattress, roughly the width of your shoulder. The pillow's job is to fill exactly that space, so your head is aligned with your spine. But this distance is not a fixed number. If your shoulder sinks deep into a soft mattress, the space to be bridged becomes smaller; if your shoulder remains on top of a firm mattress, the full shoulder width remains for the pillow.
The same pillow can therefore be too high on one bed and too low on another, without anything having changed about the pillow itself. Anyone who once slept wonderfully on a pillow that suddenly disappointed after a mattress change has experienced this mechanism firsthand.
How do you know that your mattress and pillow are no longer working together?
The signs are the same as with incorrect pillow height, only the cause is lower. Pay attention to these three: you push your hand or arm under the pillow (the pillow has become too low, often after switching to a firmer mattress), your chin points towards your chest and the top of your neck feels tense (it has become too high, often after switching to a softer mattress), or you fall asleep perfectly but wake up crooked because the mattress yields differently during the night than you were used to.
Are you unsure whether it's the pillow or the mattress? Do the mirror test from the pillow height method for side sleepers on your own bed, not on the couch or a guest bed. Only there does the result count.
Bought a new mattress? Then also review your pillow height
Most people replace their mattress at most once every eight to ten years, and it is precisely at that moment that things often go wrong: the new mattress is firmer or softer than the old one, but the familiar pillow simply moves with it. The result: a brand new bed that doesn't feel comfortable, even though neither the mattress nor the pillow is to blame. They are simply no longer attuned to each other.
Therefore, make it a habit: new mattress, new measurement. Remeasure your shoulder width on the new mattress (here's how: measuring shoulder width for your pillow height) and critically assess whether your current pillow height is still correct. Five minutes of work, and you will finally get everything out of that new purchase.
One pillow, three heights: here's how to solve it
Because the correct pillow height varies per body and per mattress, SidePillow is available in three fixed heights: 10, 11.5, and 13 cm. You choose based on your height and shoulder width, and because the dimensionally stable memory foam core does not sag, the chosen height remains consistent throughout the night; the mattress is then the only variable that still moves along.
Are you in doubt between two sizes, for example, because your mattress is on the softer side? Then choose the lower height; that is also the advice on the product page. And with 30 nights of trial sleeping, you can test the combination on your own mattress, because that's where it has to prove itself.
Conclusion
Does your mattress affect your pillow height? Absolutely: the mattress determines how deeply your shoulder sinks, and thus how much space your pillow needs to fill. Firm mattress, higher pillow; soft mattress, lower pillow. Pillow and mattress are a duo, not two separate purchases.
If something changes beneath you, then reassess what is under your head. The rule is that simple, and yet it's often overlooked.
Mattress and pillow attuned to each other again?
Choose the SidePillow height that suits your body type and let your mattress do the rest.
Frequently Asked Questions
Does your mattress affect your pillow height?
Yes. On a soft mattress, your shoulder sinks deeper, and a lower pillow is sufficient; on a firm mattress, your shoulder remains high, and the pillow needs to fill more space. Rule of thumb: firm mattress, higher pillow; soft mattress, lower pillow.
Should I buy a new pillow with a new mattress?
Not necessarily, but do check. A new mattress often yields differently than the old one, which can suddenly make your familiar pillow height too high or too low. Remeasure your shoulder width and evaluate your pillow on the new mattress.
Why is my pillow comfortable at home but not on a guest bed?
Because the mattress is different. A softer or firmer guest mattress changes how deeply your shoulder sinks, and thus how much height your pillow needs to provide. The same pillow will therefore feel slightly different on every bed.
What pillow height suits a firm mattress?
On a firm mattress, your shoulder hardly sinks, so as a side sleeper, you need relatively more pillow height: the full shoulder width must be bridged. With SidePillow, you would then choose 11.5 or 13 cm, depending on your body type.
Photography: Engin Akyurt, Kampus Production, Marcus Aurelius via Pexels.
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