Pillow height · Updated September 2026
Best Pillow Height for Side Sleepers
Side sleeping leaves the biggest gap of any position — from the outside of your shoulder to the side of your head — so it needs the most pillow. A useful starting point is 5 to 7 inches of loft, then you add for broad shoulders and a firm mattress, and subtract for a narrow frame and a plush one.
Why side sleepers need more loft than they think
On your side, the pillow is doing structural work: it is holding your head up across the full width of your shoulder. Too little loft and your head drops toward the mattress, bending your neck downward all night. Most people who say they dislike side sleeping are sleeping it on a back sleeper's pillow.
The gap is not the same as your shoulder width, though, because part of the shoulder disappears into the mattress. That is why the same pillow behaves differently on a plush bed than on a firm one.
Set your starting height
These are starting points for a home test, not measured prescriptions. Buy adjustable if you land near a boundary.
| Your build and mattress | Starting loft to test |
|---|---|
| Narrow frame, plush mattress | Around 4 to 5 inches |
| Average frame, medium mattress | Around 5 to 6 inches |
| Broad shoulders or firm mattress | Around 6 to 7 inches |
| Broad shoulders and a firm mattress | 7 inches or more — usually adjustable only |
Firmness matters as much as height
A soft pillow at 6 inches is not a 6-inch pillow once your head is on it. Side sleepers carry more weight on the pillow than back sleepers do, so soft fills collapse fastest in exactly the position that can least afford it. Denser shredded foam, latex and firmly packed adjustable fills hold their height better.
Check the fit, then check your shoulder
The home test is simple and needs another person or a phone propped on a shelf: lie down in your usual position on your usual mattress, get settled for a minute, and take a photo from behind. Your nose should line up with the centre of your chest, and the line of your neck should continue the line of your spine rather than kinking up or down.
Also check where your shoulder sits: it should be on the mattress, in front of the pillow, not squashed underneath it. If you wake with a dead arm, the mattress may be too firm for your shoulder — a pillow change will not fix that.
A badly matched pillow can leave you stiff in the morning, and fixing the fit is worth doing. But neck pain that lasts beyond a couple of weeks, pain that wakes you, or pain with numbness, tingling or weakness in an arm is not a bedding problem — that is worth raising with a clinician.