Sleep Position, Pillows and Mattresses: Do They Matter for Neck and Back Pain?

A Lot of Products, Not Much Certainty

Mattresses, pillows and sleep positions are a common focus for people with neck or back pain, and the market for products is large. It is worth separating what has actually been tested from what is simply repeated. Some of the research is reasonably informative, particularly on mattress firmness, while much of the rest is small, short and difficult to blind.

Mattress Firmness

A randomised, double-blind trial of 313 adults with chronic non-specific low back pain compared firm with medium-firm mattresses. At 90 days, people sleeping on medium-firm mattresses had better outcomes for pain in bed and for disability (Kovacs et al., 2003). A very firm mattress is often assumed to be best for back pain, and this trial did not support that assumption.

A later systematic review of 24 controlled trials reached a broadly similar conclusion, reporting that a mattress identified as medium-firm, and one that could be self-adjusted, appeared best for promoting sleep comfort, sleep quality and spinal alignment (Radwan et al., 2015). The comparisons were between broad firmness categories, not brands or price points, and the trials were generally short, so what they show is that extremes of firmness are probably unhelpful rather than that one product suits everyone.

Pillows

The evidence for pillows is weaker. A 2025 systematic review of pillows in chronic neck pain identified only five studies with 239 participants. Changes in pain were small, results for disability were inconsistent, and no pillow type, whether latex, foam or standard, showed clear superiority, while high variation between studies limited firm conclusions (Ghosh et al., 2025). Limited evidence supported specific pillows as an adjunct to other care for chronic neck pain, not as a treatment on their own.

Sleep Position and Practical Choices

For sleep position itself, no robust trial evidence was identified in preparing this article showing that one position causes, or reliably relieves, neck or back pain. Advice such as using a pillow between the knees or supporting the neck in a neutral line is generally based on comfort and clinical experience. That does not make it wrong, but it should be treated as something to try rather than a rule.

A practical approach is to choose a medium-firm surface and a pillow that keeps the neck comfortable in the position you actually sleep in, and to change one thing at a time so the effect can be judged. Pain that wakes someone at night, is progressively worsening, or comes with other symptoms warrants assessment instead of a new mattress.