Why pillows matter as much as your mattress#

Your mattress keeps your spine aligned from shoulder to hip; your pillow keeps your neck and head in line with the rest of your spine. A pillow that's too high, too low, too soft or too firm can cause persistent neck pain and headaches, even if your mattress is excellent.

Fill types explained#

Memory foam: Contours to head and neck shape. Good pressure relief. Sleeps warm. Available in solid or shredded (adjustable loft) versions. Best for side sleepers needing firm support.

Latex: Responsive and more breathable than memory foam. Returns to shape quickly. Good durability. Suits all sleep positions; particularly good for hot sleepers.

Down and feather: Soft, mouldable, lightweight. Natural temperature regulation. Down (no quills) is softer; feather (with quills) is firmer. Requires regular fluffing. Avoid if you have feather allergies.

Synthetic fill (microfibre/hollowfibre): Hypoallergenic, machine washable, affordable. Less durable than natural fills. Good for allergy sufferers.

Loft height by sleep position#

Side sleepers, high loft (10–14 cm): Needed to fill the space between head and mattress and keep the cervical spine level. Too low allows the head to drop sideways.

Back sleepers, medium loft (7–10 cm): Supports the natural cervical curve without pushing the head too far forward.

Stomach sleepers, low loft (under 7 cm): Prevents hyperextension of the neck. A very flat pillow or no pillow at all is sometimes preferable.

When to replace your pillow#

Replace pillows every 1–2 years. The fold test: fold the pillow in half and release. If it doesn't spring back, the fill has collapsed and it no longer provides adequate neck support.

Match the pillow to the mattress, not just to your position#

Loft recommendations by sleeping position are the standard advice, and they are a good starting point, but they assume the mattress is neutral. It rarely is. The softer your mattress, the further your shoulder sinks into it, and the smaller the gap left between your head and the surface - which means you need a lower pillow, not the one the chart recommends.

The practical version: if you have just moved to a softer mattress and started waking with neck ache, the pillow you kept is probably now too high. If you have moved to a firmer mattress, the same pillow may now be too low. The pillow and the mattress are one system, and changing either changes what the other needs.

A quick check anyone can do: lie in your normal sleeping position and have someone look at you from the front or behind. Your nose should line up with the centre of your chest, and your head should be neither tipped up towards the ceiling nor dropped towards the mattress. If it is tipped, the loft is wrong.

Shredded fill and the adjustable option#

If your position varies through the night, or you are between loft categories, a shredded-fill pillow that you can open and remove handfuls from is the most forgiving choice. It is the only fill type where you can tune the height to your actual mattress rather than guessing from a chart, and it is far cheaper than getting the guess wrong twice. Remove small amounts, use it for several nights, and repeat - it is easy to take fill out and irritating to put it back.

Looking after it#

  • Use a protector as well as a pillowcase. Pillows absorb a surprising amount of moisture, and it is moisture, not use, that breaks fills down.
  • Air it. Twenty minutes uncovered while you strip the bed does more for a pillow than any amount of plumping.
  • Check the washing instructions before you wash. Synthetic fills are usually machine washable; memory foam and latex generally are not, and soaking either will destroy it. Wash the protector instead.
  • Replace on condition, not on schedule. The fold test is the useful one: if a folded pillow does not spring back when released, the fill has collapsed, whatever its age.

If neck pain is the reason you are reading this, the mattress may be the larger factor - see our guide to the best mattress for neck pain.

Frequently asked questions#

How many pillows should I sleep with?#

One, at the right loft, for most people. Stacking two is a common way to compensate for a pillow that is too low, but the stack tends to angle the head forward rather than support it, which is what causes morning neck stiffness. Side sleepers often benefit from a second pillow between the knees instead, which keeps the hips level.

Is memory foam or latex better for a hot sleeper?#

Latex, generally. It is naturally more open in structure and does not soften and cling as it warms the way memory foam does. A shredded fill of either sleeps cooler than a solid block, because air can move through it.

Can the wrong pillow really cause headaches?#

It can contribute to them. Sustained neck extension or side-bending through the night loads the muscles at the base of the skull, and tension headaches on waking are a recognised pattern. If headaches persist after correcting the pillow, see a GP rather than buying another one.

Do I need a special pillow for an adjustable bed?#

Not a special one, but a stable one. On a raised head section, soft or loose-filled pillows tend to slide forward through the night. A firmer or shaped pillow stays put better. See our adjustable beds guide.