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Side sleeping is the most popular sleep position in the UK — surveys consistently show that around 60% of adults spend most of the night on their side. And yet, it's one of the most misunderstood positions when it comes to mattress choice. The wrong mattress doesn't just make a side sleeper uncomfortable — it creates genuine problems: shoulder pain, hip pain, pressure point discomfort, and the kind of interrupted night that leaves you feeling worse in the morning than when you went to bed.

This guide explains exactly what a side sleeper needs from a mattress, which mattress types deliver it, which firmness levels to avoid, and what to look for if you're a side sleeper with back pain, a heavier build, or sharing a bed with a partner who sleeps differently to you.

Why Side Sleepers Need a Different Mattress

When you sleep on your side, two points of your body bear significantly more weight than anywhere else: your shoulder and your hip. These are the widest parts of the body and, when you lie on your side, they push into the mattress surface more forcefully than the waist, which is narrower and less heavy.

On a mattress that's too firm, those pressure points don't sink in enough. The shoulder and hip are pushed back upward, which forces the spine out of its natural alignment. The result is a curved, stressed spinal position maintained for hours — and you wake up with aching shoulders, a sore lower back, or both.

On a mattress that's too soft, the opposite problem occurs. The heavier zones — hips especially — sink too deeply, causing the spine to curve downward into a hammock shape. This is equally problematic for spinal alignment and can cause lower back discomfort over time.

The right mattress for a side sleeper sits in the middle: it should contour around the shoulder and hip to relieve pressure, while supporting the waist to keep the spine in a straight, neutral line from the neck to the tailbone.

The Right Firmness Level for Side Sleepers

Firmness is the single most important variable for side sleepers, and getting it wrong is the most common mistake people make when buying a mattress.

As a general guide:

These are guidelines rather than rules — individual body shape matters as much as weight. Someone with very broad shoulders but a slim waist may need a slightly softer surface than their weight alone would suggest. Someone with a heavier lower body may need more support at the hip zone specifically.

The key principle: never buy a firm mattress as a side sleeper unless specifically advised by a medical professional. A firm mattress is designed for back or front sleepers and will almost always cause pressure point discomfort when used by someone who predominantly sleeps on their side.

Best Mattress Types for Side Sleepers

Once you understand what a side sleeper's body needs, the mattress types that deliver it become clear. Here are the four main options and how each performs.

Memory Foam Mattresses

Memory foam is often the first recommendation for side sleepers, and for good reason. The material is viscoelastic — it responds to both body heat and pressure, softening and conforming to the exact contours of the shoulder and hip. This creates a cradling, pressure-relieving effect that is particularly effective for side sleepers who experience joint discomfort.

The advantages for side sleepers are clear:

• Excellent pressure relief at shoulders and hips
• Conforms precisely to body shape, supporting the natural curve of the spine
• Very low motion transfer — ideal for side sleepers sharing a bed
• No pressure points from springs or hard surfaces

The considerations:

• Traditional memory foam can retain heat — look for models with open-cell foam, gel infusions, or graphite layers if you sleep warm
• Can feel slow to respond when changing position — some side sleepers find it feels slightly restrictive if they move frequently during the night
• Works best on a firm, flat base — an ottoman base or platform top divan is ideal pairing. Our divan bed guide explains base types in detail.

For side sleepers who experience shoulder or hip pain, a medium or medium-soft memory foam mattress is almost always the first type worth trying.

Pocket Sprung Mattresses

Pocket sprung mattresses use individually wrapped springs that respond independently to pressure. Unlike open coil springs (which move as a unit), pocket springs compress individually — so the spring beneath your shoulder can respond differently to the spring beneath your waist.

This independence is what makes a quality pocket sprung mattress well-suited to side sleepers: the springs beneath the heavier zones can compress more, allowing the shoulder and hip to sink in appropriately, while springs beneath the lighter waist zone provide firmer support to keep the spine straight.

Look for:

• Higher spring count — more springs means more precise, targeted support. A quality double pocket sprung mattress will have 1,000+ springs; premium models 2,000+
• Zoned spring systems — some pocket sprung mattresses use springs of different tensions in different zones (softer at shoulders, firmer at hips and back). These are particularly well-suited to side sleepers
• Medium tension — avoid firm-rated pocket sprung options as a side sleeper unless you're significantly over 90 kg

Our guide on pocket sprung vs memory foam mattresses compares both in detail and can help you decide which direction suits you better.

Hybrid Mattresses

Hybrid mattresses combine a pocket sprung core with one or more foam comfort layers — typically memory foam or latex — on top. For side sleepers, this combination often delivers the best of both worlds: the targeted pressure relief of foam at the sleeping surface, combined with the responsive, breathable support of springs beneath.

Hybrids tend to be the premium option in most mattress ranges, and for side sleepers who want both pressure relief and support — particularly those who sleep warm and find pure memory foam uncomfortably hot — a hybrid is often the most satisfying long-term choice.

Key considerations:

• Heavier than foam-only mattresses — typically 30–55 kg for a double — so worth checking your bed base's weight rating
• Generally more expensive than single-material mattresses
• Offer better edge support than foam-only options, which is useful for side sleepers who sleep close to the edge

Latex Mattresses

Natural latex mattresses offer a pressure-relieving quality similar to memory foam but with a more responsive, buoyant feel. Rather than the slow-sinking sensation of memory foam, latex compresses and recovers quickly — which many side sleepers prefer, particularly those who change position frequently during the night.

Latex is also naturally breathable and temperature-neutral, making it a strong option for side sleepers who sleep warm. The trade-off is cost: natural latex mattresses are typically among the most expensive options in the market, though their durability (often 15–20 years with proper care) can make them cost-effective over time.

Best Mattress for Side Sleepers with Back Pain

Side sleeping with back pain adds a layer of complexity to mattress choice, because the requirements are slightly different depending on which part of the back is affected.

Lower Back Pain

Lower back pain in side sleepers is most commonly caused by the hip sinking too deeply into a soft mattress, creating a downward curve in the lumbar spine. The solution is counterintuitive: a slightly firmer surface than you might choose for comfort alone, combined with a mattress that provides strong lumbar support — typically a medium-firm pocket sprung or hybrid.

A supportive pillow between the knees can also significantly reduce lower back stress for side sleepers by keeping the hips, pelvis, and lower spine in better alignment throughout the night.

Upper Back and Shoulder Pain

Upper back and shoulder pain in side sleepers is almost always caused by a mattress that's too firm — the shoulder is not sinking in enough, causing the upper spine to be pushed upward and out of alignment. A softer surface at the shoulder zone is the primary fix: medium-soft memory foam or a zoned pocket sprung mattress with softer springs at the shoulder area.

General Guidance

If you have ongoing back pain, it's worth consulting a physiotherapist or GP about your sleep position and mattress choice — particularly before spending significantly on a new mattress. Many back pain sufferers find that the mattress is not the only variable: a poor pillow height, misaligned sleep posture, or an unsuitable bed base can all contribute. Our guide on the best mattress for back pain UK covers this topic in much more depth.

Best Mattress for Side Sleepers Who Share a Bed

Couples where one or both sleepers is a side sleeper face an additional challenge: different body weights, shapes, and sleep positions can mean different optimal firmness levels. Here's how to navigate it.

Both Side Sleepers of Similar Weight

This is the simplest scenario. Choose a medium firmness in a pocket sprung or hybrid mattress and you'll likely satisfy both sleepers. If both are on the lighter side (under 65 kg), lean toward medium-soft.

Side Sleeper and Back Sleeper

This is the most common mismatched pairing. Back sleepers generally need a firmer surface than side sleepers for optimal spinal support. A medium-firm pocket sprung mattress is usually the best compromise — firm enough for the back sleeper, with enough give to relieve pressure for the side sleeper.

Alternatively, a zoned mattress — softer at the top where shoulders rest, firmer at the hip and waist — can serve both positions effectively if each person stays on their own side of the bed.

Significantly Different Body Weights

If one partner is significantly heavier than the other, consider a zip-and-link mattress — two single mattresses of different tensions joined together — which allows each side of the bed to be perfectly tuned to each sleeper's requirements.

What to Avoid as a Side Sleeper

Knowing what not to buy is as useful as knowing what to look for.

Avoid firm mattresses. Unless you're significantly over 90 kg, a firm mattress will not provide enough pressure relief at the shoulder and hip for comfortable side sleeping. This is the single most common mattress mistake side sleepers make.

Avoid very cheap open-coil mattresses. Open-coil (or Bonnell coil) mattresses use a connected spring system that moves as a unit rather than responding independently to pressure. They provide poor zoned support and are rarely a good match for side sleepers who need differentiated response at shoulder, waist, and hip.

Avoid mattresses that are too soft if you're over 75 kg. A very soft mattress will cause the hips to sink too deeply, misaligning the lumbar spine downward. Pressure relief and support need to be balanced — not just maximised for softness.

Avoid mattresses without a trial period. Sleep position and body response to a mattress is personal. Any reputable UK mattress brand should offer a minimum 30-night trial; many now offer 100 nights or more. Never buy a mattress of significant value without a trial period.

Pairing Your Mattress with the Right Bed Base

Your mattress choice only performs as designed when paired with an appropriate base. For side sleepers, this matters because the base affects how the mattress responds.

Memory foam mattresses perform best on a solid, flat platform top — such as the base of an ottoman bed or a platform top divan. A sprung base changes the feel of memory foam and can reduce its pressure-relieving effectiveness.

Pocket sprung and hybrid mattresses work well on both platform tops and slatted bases, though closely spaced slats (no more than 6 cm apart) are recommended to prevent uneven support. Ottoman bases with solid platform tops are a practical and popular pairing.

For side sleepers looking for a bed base that maximises both comfort and storage, our ottoman beds collection includes double, king, and super king options in a range of fabrics. Our divan beds collection covers platform top and sprung base options with drawer storage. And if you're looking at upholstered bed frames with slatted bases, our upholstered beds collection has a full range of styles.

Pillow Choice for Side Sleepers

The mattress is only half the equation. A side sleeper's pillow height — technically called loft — plays an equally important role in spinal alignment. When lying on your side, the pillow needs to fill the gap between your ear and the mattress surface, keeping your neck at the same horizontal height as your spine.

• Too flat a pillow: the head drops toward the mattress, causing the neck to angle downward and straining the cervical spine
• Too thick a pillow: the head is pushed upward, causing the neck to angle toward the ceiling and creating tension in the upper back and neck

For most side sleepers, a medium-to-high loft pillow (typically 12–15 cm of compressed thickness) in memory foam or a supportive latex is the best starting point. Adjustable fill pillows — particularly those filled with shredded memory foam or buckwheat — allow you to fine-tune the loft precisely.

FAQ: Best Mattress for Side Sleepers UK

What firmness mattress is best for side sleepers?

Most side sleepers do best on a medium or medium-soft mattress. This allows the shoulder and hip to sink in enough to relieve pressure, while supporting the waist to keep the spine straight. Heavier side sleepers (over 90 kg) may find a medium-firm more supportive; lighter sleepers (under 65 kg) may prefer soft to medium-soft.

Is memory foam or pocket sprung better for side sleepers?

Both can work well for side sleepers. Memory foam offers superior pressure relief and motion isolation, making it excellent for those with joint discomfort. Pocket sprung offers more responsive, breathable support and tends to feel less warm. A hybrid combining both is often the best option if budget allows. Our pocket sprung vs memory foam guide covers this comparison in full.

Can a mattress cause shoulder pain in side sleepers?

Yes — this is one of the most common causes of shoulder pain that isn't injury-related. A mattress that's too firm pushes back against the shoulder rather than allowing it to sink in, creating sustained pressure on the shoulder joint and surrounding soft tissue over hours of sleep. Switching to a medium or medium-soft mattress resolves this in many cases.

How long should a mattress last for a side sleeper?

A quality mattress should last 8–10 years for most sleepers. Side sleepers may find their mattress shows wear slightly earlier at the shoulder and hip zones, as these areas compress the mattress more than others. Rotating your mattress regularly (180 degrees, head to foot) can extend its life by distributing wear more evenly.

Is a firm mattress ever suitable for side sleepers?

Rarely. A firm mattress is primarily designed for back and front sleepers, who need a flat, stable surface to maintain spinal alignment. For side sleepers, a firm surface typically causes pressure point discomfort at the shoulder and hip. The only scenario where a firmer mattress may suit a side sleeper is if they are significantly over 90 kg and find medium options sag excessively — in which case a medium-firm (not a hard firm) is the most appropriate choice.

What is the best mattress for side sleepers with hip pain?

Hip pain in side sleepers is almost always a pressure issue — the hip is not sinking in enough or is sinking in too deeply and misaligning the pelvis. A medium memory foam or medium pocket sprung mattress with a zoned support system is typically the most effective solution. If hip pain is persistent, it's worth seeking advice from a physiotherapist alongside changing your mattress.

Do side sleepers need a special pillow?

Yes — pillow loft matters as much as mattress choice for side sleepers. You need a pillow tall enough to fill the gap between your ear and the mattress, keeping your neck aligned with your spine. Most side sleepers need a medium-to-high loft pillow — memory foam contour pillows and adjustable-fill pillows are both popular choices.

Is it bad to always sleep on the same side?

Sleeping consistently on the same side can create uneven wear patterns in your mattress over time, and may cause one shoulder or hip to develop more pressure-related discomfort than the other. It's generally recommended to alternate sides where possible, and rotating your mattress regularly helps manage the wear pattern.

Conclusion

Choosing the right mattress as a side sleeper comes down to one central principle: your mattress needs to relieve pressure at the shoulder and hip while supporting the waist. Get that balance right — typically with a medium or medium-soft pocket sprung, memory foam, or hybrid mattress — and most side sleepers find their sleep quality improves significantly within the first few weeks.

Avoid firm mattresses, prioritise a trial period, and consider your base as part of the equation — because even the right mattress performs poorly on the wrong foundation.

If you're looking for a bed base to pair with a new mattress, our ottoman beds collection and divan beds collection both offer solid platform top options that work well with memory foam and hybrid mattresses. For upholstered frames with slatted bases suited to pocket sprung, our upholstered beds collection has a wide range of styles in double, king, and super king sizes. And if you're also dealing with back pain alongside your sleep position, our best mattress for back pain UK guide covers the additional considerations in detail.