Best Pillow for Side Sleepers: A UK Buying Guide
The best pillow for side sleepers is a medium-firm to firm pillow tall enough to fill the space between your ear and the outside edge of your shoulder, so your head stays level with your spine. For most adults that means a height of roughly 10 to 15 cm (4 to 6 inches) once your head is on it, in a material that keeps its height all night: memory foam, latex, or a well-filled adjustable pillow. Broad shoulders and a firm mattress push you towards the top of that range. A narrow frame or a soft mattress pushes you towards the bottom.
Why side sleeping asks more of a pillow
On your back, your head only needs to sit a few centimetres above the mattress. Turn onto your side and the gap becomes the full width of your shoulder. If the pillow is too low, your head tips towards the mattress and the muscles on the upper side of your neck stay stretched for hours. Too high and they are squashed instead. A stiff neck in the morning, or a dead arm at 3am, is the usual result.
A quick check: lie on your side on your current pillow and ask someone to look at you from behind. Your nose should line up with the centre of your chest. If your head angles down towards the mattress, you need more height.
What to look for
Height that matches your shoulders
Measure from the base of your neck to the edge of your shoulder. Take a little off for how far your shoulder sinks into the mattress, and that is roughly the compressed height you need. A standard UK pillow is 50 x 75 cm, but height varies a lot between pillows of the same size, and a plump hollowfibre pillow can squash to half its height under the weight of a head.
Firmness
Medium-firm or firm. A soft pillow feels lovely at bedtime, then your head sinks through it by the early hours. If you prefer soft, pick one with adjustable fill or be ready to use two.
How your mattress changes things
A soft mattress or a thick topper lets your shoulder sink further, which shrinks the gap. A firm mattress holds your shoulder up, so you need more pillow. If you change your mattress, check your pillow height at the same time.
Temperature and the cover
Side sleepers spend the night with one cheek pressed into the pillow, so the fabric against your face matters more than in other positions. Dense foam can hold heat, and a breathable cover helps. A removable, washable cover is useful too, since it soaks up skin oils and sweat every night.
Pillow types compared
| Type | Feel | Height | Suits | Downside |
|---|---|---|---|---|
| Contoured memory foam | Firm, shapes slowly | Fixed, with a neck curve | Neck and shoulder stiffness; people who want set support | Can feel odd for the first few nights; height can't be changed |
| Standard memory foam | Firm, dense | Fixed | Consistent support all night | Can sleep warm |
| Shredded foam or layered | Medium, mouldable | Adjustable | Anyone unsure of their ideal height | Fill can clump and needs plumping |
| Latex | Springy | Fixed or adjustable | Restless sleepers who turn often | Heavy; not for latex allergies |
| Hollowfibre or microfibre | Soft | Drops overnight | A traditional feel; machine washing | Flattens; often need two |
| Buckwheat | Very firm | Adjustable | Hot sleepers who like firm | Rustles when you move |
Memory foam is the most common choice for side sleepers because it keeps its height and spreads pressure across the side of your head. Contoured versions add a raised edge under the neck, so the gap between shoulder and jaw is filled as well as the gap under your head.
If you have tried several fixed pillows and none feels right, an adjustable one lets you experiment. Several UK brands, including Emma and Simba, sell pillows with removable layers or fill for this reason.
Latex suits people who flip from one side to the other a lot, because it springs back quickly instead of holding the dent from your last position. And hollowfibre, the kind sold in most supermarkets, is fine as a budget option if you replace it often and accept that one pillow is rarely enough on its own.
Side sleepers with lower back or hip pain
A head pillow only looks after the top of your spine. Lower back and hip ache in side sleepers often starts lower down: the top leg slides forward and drops, the pelvis rotates, and the lower back twists with it. A firm pillow between the knees (or a long body pillow you can rest your top leg on) keeps the knees stacked and the pelvis level. It costs little and is worth trying first.
The mattress plays a part too. On a firm mattress, your hip and shoulder take most of your weight while your waist can sag. A topper changes how much those points sink in without replacing the bed. Our DreamAlign Side Sleeper Mattress Topper is made for people who sleep on their side, and the DreamAlign Pressure Point Relief Mattress Topper is aimed at pressure points. After adding a topper you will lie a little deeper, so recheck your pillow height.
If back or hip pain is persistent or getting worse, see your GP or a physiotherapist. A pillow or topper can make sleeping position more comfortable, but it is no substitute for finding the cause.
Where the Dosaze pillow fits, and where it doesn't
The Dosaze Contoured Orthopaedic Pillow is a contoured memory foam pillow shaped to cradle the natural curve of your neck and keep your spine aligned while you sleep. It suits side sleepers who want a pillow with a set shape that holds its support through the night. It also works for back and stomach sleepers, which helps if you roll over in the small hours. The fabric is naturally cooling and anti-microbial, the cover comes off for washing, and the memory foam is CertiPUR-US certified. It ships locally within the UK.
It is a poor match if you love a soft, squashy pillow you can punch into shape, or if you want to add and remove fill to fine-tune the height; a shredded foam or layered pillow does that better. Contoured pillows can also take a few nights to get used to, especially if you have only ever slept on fibre or feather.
Frequently asked questions
What height pillow does a side sleeper need?
Most side sleepers need a pillow that sits roughly 10 to 15 cm (4 to 6 inches) high once your head is resting on it. Measure from the base of your neck to the edge of your shoulder as a starting point. Choose a little lower if your mattress is soft and a little higher if it is firm or your shoulders are broad.
Is memory foam good for side sleepers?
Memory foam suits many side sleepers because it keeps its height overnight and spreads pressure across the side of the head. Contoured memory foam also supports the neck, filling the gap under your jaw. The main drawbacks are that solid foam can feel warm and some people dislike its slow sink.
Should side sleepers put a pillow between their knees?
It often helps, especially if you get lower back or hip ache. A firm pillow between the knees stops your top leg dropping forward and twisting your pelvis. Any firm cushion will do to test whether it makes a difference before you buy a dedicated knee or body pillow.
How do I know my pillow is too flat for side sleeping?
Lie on your side and have someone look at you from behind: if your head tips down towards the mattress, the pillow is too low. Waking with stiffness on the upper side of your neck, or folding the pillow in half to get comfortable, are other signs. Fibre pillows that no longer spring back after being folded have usually lost their height.
