Side sleeping is the most common sleeping position in the UK, yet most pillows are not built for it. Sleep on your side with the wrong pillow and your head drops towards the mattress, your neck bends out of line with your spine, and you wake with a stiff neck or numb shoulder.
Quick answer: The best pillow for side sleepers is a medium to high loft pillow, around 10 to 12cm deep, with a medium-firm feel that fills the gap between your ear and shoulder. Memory foam works particularly well because it holds its height all night while cushioning pressure on the ear and jaw.
Why side sleepers need a different pillow
When you lie on your side, your shoulder props your body away from the mattress. That leaves a large gap between your head and the bed, far bigger than the gap when you lie on your back.
Your pillow's only job is to fill that gap exactly. Too thin and your head tilts down all night; too thick and it tilts up. Either way the neck spends hours bent to one side, which is a common trigger for morning neck pain and stiffness.
The Sleep Foundation recommends a medium to high loft of at least 10cm for side sleepers, with a medium to medium-firm feel. Softer pillows let the head sink through and lose the height you need, while very firm pillows push tension into the neck and shoulders.
What to look for in a side sleeper pillow
Loft (height). Around 10 to 12cm suits most side sleepers. Broad shoulders need the top of that range; petite frames or a soft, sinky mattress may need slightly less.
Firmness. Medium to medium-firm. The pillow has to hold your head level for eight hours, not just feel plump when you first lie down.
Material. Memory foam is the standout for side sleeping because it supports consistently and contours around the ear and jaw, easing the pressure points that make side sleepers flip the pillow all night. Feather and down feel luxurious but flatten under the head, so they rarely hold enough height for a full night on your side.
Temperature. Side sleepers press one cheek into the pillow all night, so heat builds quickly. Gel-infused foam or cooling covers make a noticeable difference if you sleep warm.
Allergies. Pillows are a favourite habitat for dust mites. If you wake congested, a naturally hypoallergenic, dust mite resistant pillow is worth having, alongside the habits in our guide to dealing with dust mites in your bed.
The REM-Fit pillows that suit side sleepers
Every REM-Fit pillow uses a memory foam core, which is the right starting point for side sleeping. The table below shows which one fits which kind of side sleeper.
| Pillow | Depth and feel | Best for |
|---|---|---|
| Bamboo Charcoal Pillow (12cm high depth) | High loft, medium-firm memory foam | Dedicated side sleepers, allergy sufferers |
| 500 Cool Gel Pillow | Contouring gel-infused memory foam | Side sleepers who overheat at night |
| Snow Pillow | Visco memory foam, cold-touch cover | Hot sleepers who want a genuinely cold surface |
The high-loft option: Bamboo Charcoal Pillow in 12cm depth
Most pillows come in one height and hope for the best. The REM-Fit Bamboo Charcoal Pillow comes in two depths, and the 12cm high depth version exists precisely for side sleepers who need extra loft to keep the neck level.
The bamboo charcoal infused memory foam is naturally hypoallergenic and dust mite resistant, and it helps regulate temperature and moisture overnight. It comes with a 5-year guarantee, and the 8cm low depth version covers anyone in the household who sleeps on their back or front.
REM-Fit Bamboo Charcoal Pillow
Choose the 12cm high depth for the loft side sleepers need, with naturally hypoallergenic, dust mite resistant bamboo charcoal foam.
Shop the Bamboo Charcoal PillowThe award winner: 500 Cool Gel Pillow
If you sleep on your side and run hot, the 500 Cool Gel Pillow is the one to look at. It won Good Housekeeping's Best Memory Foam Pillow award in 2026, with gel-infused memory foam that supports spinal alignment while drawing heat away from your head and neck through the night.
That combination matters for side sleepers: contouring foam relieves pressure on the ear and jaw, and the gel stops the heat build-up that comes from having one side of your face on the pillow all night.
REM-Fit 500 Cool Gel Pillow
Good Housekeeping Winner 2026. Gel-infused memory foam that keeps side sleepers aligned and cool all night.
Shop the 500 Cool Gel Pillow✓ 100-night trial ✓ Free UK delivery ✓ 0% finance
If cold to the touch is your single priority, the Snow Pillow takes cooling further still, with a Nordic chill cover over a Visco memory foam core. You can compare the full range in the REM-Fit pillow collection.
Common side sleeper pillow mistakes
Stacking two flat pillows. Two soft pillows never hold a stable height; they shift apart and leave your neck moving all night. One pillow at the correct loft beats any stack.
Keeping a pillow past its best. A memory foam pillow that has lost its height cannot support a side sleeper, however good it was new. Our guide to how often to replace your pillow covers the signs it is time.
Ignoring the mattress. The pillow keeps your neck level, but your mattress sets the height of your shoulder. If your shoulder cannot sink slightly into the surface, no pillow height will fully fix your alignment. Our guide to hybrid mattresses for side sleepers explains what to look for.
Persistent neck pain that does not improve with a better pillow setup is worth discussing with your GP or a physiotherapist. The NHS neck pain guidance covers when to seek help.
Frequently asked questions
How thick should a pillow be for a side sleeper?
Around 10 to 12cm for most people. You want your nose level with the centre of your chest when lying on your side. Broad shoulders push you towards 12cm; a soft mattress that lets your shoulder sink may mean slightly less.
What type of pillow do experts recommend for side sleepers?
Sleep organisations such as the Sleep Foundation point side sleepers towards medium to high loft pillows with a medium-firm feel, and highlight memory foam for its pressure relief and consistent support. The right height for your shoulder width matters more than any single material.
Is memory foam good for side sleepers?
Yes. Memory foam holds its loft through the night and contours around the ear and jaw, which relieves the pressure points side sleeping creates. Gel-infused versions like the 500 Cool Gel Pillow add cooling for people who sleep warm.
Should side sleepers use one pillow or two?
One pillow at the right height, under your head. A second pillow is useful between the knees, where it keeps the hips level and reduces twist through the lower back, but stacking two under your head makes alignment worse.
How often should side sleepers replace their pillow?
Every 2 to 3 years for most fills, or as soon as the pillow no longer springs back to its full height. Side sleepers rely on loft more than any other sleeping position, so a flattened pillow affects them first. Regular washing helps it last; see our guide to washing pillows properly.
