Best Mattress for Side Sleepers: A UK Buying Guide

Side sleeping puts far more concentrated pressure on two specific points — the shoulder and the hip — than back or front sleeping does, which means the mattress that suits a side sleeper is often quite different from what suits someone in another position, even at the same overall firmness rating.

Why Side Sleepers Need Different Support

Lying on your side means your body weight funnels through two relatively small contact points instead of being spread across your whole back. A mattress that's too firm for this position can't cushion those points enough, creating pressure that leads to a numb arm, a sore hip, or shoulder stiffness by morning. A mattress that's too soft, on the other hand, lets the hips sink too far, pulling the spine out of alignment in the opposite direction.

The Right Firmness for Side Sleepers

Most side sleepers do best on soft to medium-soft firmness — enough give to cushion the shoulder and hip properly, without so much sink that the spine loses its neutral alignment. This is softer than what's usually recommended for back or front sleepers, which is one of the most common mismatches when someone buys a mattress based on general firmness advice rather than their actual sleep position.

Body weight shifts this slightly: heavier side sleepers may need to move toward medium rather than soft, since more weight compresses any given firmness level further than the label alone suggests.

Which Mattress Types Work Best

• Memory foam is a strong fit for side sleepers specifically because it contours closely around the shoulder and hip rather than pushing back against them, which is exactly the kind of pressure relief this position needs.
• Pillowtop mattresses work well too — the plush top layer cushions those same pressure points, while a firmer core underneath still provides real support.
• Pocket sprung mattresses can suit side sleepers if paired with a genuinely soft comfort layer, but a firm all-spring mattress with no dedicated comfort layer is usually a poor match for this position.
• Orthopaedic mattresses, built around firm, consistent support, are generally not the best fit for side sleeping specifically, even though they're often marketed as a universal "healthy back" choice — the firmness that helps a back sleeper's spine can create exactly the pressure-point problem a side sleeper is trying to avoid.

Making the Decision

If you're a side sleeper, start from soft to medium-soft firmness and look toward memory foam or pillowtop constructions specifically, rather than assuming firmer is automatically better for spinal support — for this particular sleep position, it usually isn't.