How researchers test height

A 2021 review identified cervical-spine alignment, body dimensions, head-neck contact pressure, and neck-and-shoulder muscle activity as variables studied in pillow-height research. It found insufficient evidence for an optimal range and no firm conclusion on optimal height for people lying on their back or side.

The review did not assess the quality of its included studies. Most were short term and involved young, healthy adults, and two authors were industry employees. Its list of variables helps describe the research. It cannot select a height, support a mattress-firmness rule, or establish a clinical or sleep benefit.

Fixed laboratory heights are test conditions

In a 2016 immediate laboratory test, ten healthy adults lay on their back on one foam cervical-pillow setup at four heights. Increasing the tested height changed measured cranial and cervical pressure within that setup. The paper also stated that universal evidence-based pillow-selection guidance was not available.

The test captured immediate measurements. The group contained ten healthy young adults, the cervical-spine results used a simplified finite-element model, and three authors worked for the pillow manufacturer. The tested heights and reported pressure changes are not consumer advice. They do not establish comfort, sleep quality, pain relief, long-term results, or product performance.

Fixed values are useful for comparing conditions inside a study. They do not become a target for every reader once they leave that setup.

Body-relative research asks a different question

A 2024 laboratory study of nine healthy side sleepers suggests that body dimensions can matter when researchers study height and neck support. That finding is about a small group and a specific setup. It does not authorize using the study's heights as shopping guidance or validate a commercial fit process.

The contrast is simple: a fixed-height study compares set test conditions, while a body-dimension study examines whether measurements matter to the research question. Neither supplies a general-purpose height formula.

Keep product philosophy and science apart

Thijs van der Hilst is a certified physical therapist from The Netherlands. Thijs frames pillow selection as a sizing question, comparing a small set of standard pillow sizes with a shoe shop that offers only a few shoe sizes.

That analogy is first-party product philosophy. It does not establish the correct height for a person or prove an outcome.

A separate product process

PillowScan uses body measurements, sleep position and mattress firmness as inputs.

PillowScan produces a Personal Pillow Code used to match a YOUP pillow configuration.

The research above does not validate this process or its decision rule. If you want to use it as a next step, start PillowScan.

Sources

Common questions

Is there an optimal pillow height?

A 2021 review identified cervical-spine alignment, body dimensions, head-neck contact pressure, and neck-and-shoulder muscle activity as variables studied in pillow-height research. It found insufficient evidence for an optimal range and no firm conclusion on optimal height for people lying on their back or side.

Does pillow height affect neck pressure?

In a 2016 immediate laboratory test, ten healthy adults lay on their back on one foam cervical-pillow setup at four heights. Increasing the tested height changed measured cranial and cervical pressure within that setup. The paper also stated that universal evidence-based pillow-selection guidance was not available.

Does body size affect pillow height?

A 2024 laboratory study of nine healthy side sleepers suggests that body dimensions can matter when researchers study height and neck support. That finding is about a small group and a specific setup. It does not authorize using the study's heights as shopping guidance or validate a commercial fit process.