Last seen for £255 at Mattress Man on 10th November 2026
Silentnight Memory 3 Sleep Single Mattress
The Silentnight Memory 3 Sleep Mattress is a memory foam mattress from one of Britain's best-known bed brands.
- Medium feel for most sleepers
- Memory foam softens pressure points
- Fits UK & EU bed frames
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
More available sizes
Last seen for £395 at Mattress Man on 10th November 2026
Last seen for £449 at Mattress Man on 10th November 2026
Last seen for £395 at Mattress Man on 10th November 2026
Last seen for £335 at Mattress Man on 10th November 2026
Last seen for £345 at Mattress Man on 10th November 2026
Last seen for £255 at Mattress Man on 10th November 2026
Last seen for £249 at Mattress Man on 10th November 2026
Mattress details
Mattress
Silentnight Memory 3 Sleep Mattress
Size
Firmness
Medium
Construction
Foam
Memory Foam
Depth (cm)
Layers
2
Layer Details
Foam layer (top)
The first of two foam layers in an 18 cm mattress. Together they give the medium feel, with memory foam that softens as it warms and gives your hips and shoulders a gentler landing.
Foam layer (base)
The second foam layer sits beneath the first. It is part of an all-foam build, so you get a steady, sprung-free feel rather than the bounce of a pocket spring mattress.
Layer details from mattressman.co.uk and robertdyas.co.uk product pages, October 2026.
Key benefits
- Fits compact rooms: At 90cm wide, this single leaves floor space for a wardrobe, desk and toy storage, and we suggest a room of just 2.1m x 2.8m.
- Works for sharing siblings: Two UK singles plus a walkway fit in many children's rooms where one larger bed would leave no play space at all.
- Guest room friendly: In a spare room that doubles as an office, a single keeps the desk usable, and memory foam suits guests of most sleeping positions.
- Cheap, easy bedding: Standard single sheets and a 135 x 200cm single duvet fit, and both are the most widely stocked bedding of any UK size.
- Gentle for growing sleepers: The foam contours to lighter bodies rather than pushing back like firm springs, which many children and teens find easier to settle on.
This size suits you if...
You're buying for a child's or teenager's room, kitting out a spare room or student flat where the frame is already provided, or you sleep alone in a compact space such as a loft conversion where only a narrow footprint fits under the slope. At 3ft x 6ft 3in, it's the sensible default for one sleeper on a budget.
Consider another size if...
You're an adult who shares the bed, or you simply want more room to stretch out. The UK double is 45cm wider at the same length, and we'd recommend it instead; allow at least 2.6m x 2.8m of floor space.
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FAQ's
Will the Silentnight Memory 3 single fit a bunk or mid sleeper frame?
The 90 x 190cm footprint matches standard UK bunk and mid sleeper frames, so width and length are fine. Raised frames often set a maximum mattress depth for the safety rail, though, and Silentnight doesn't publish detailed depth information for this model, so check your frame's guidance against the listing before you order.
Is the UK single Memory 3 big enough for an adult?
For one adult, yes: 90 x 190cm is the standard UK one-person size and suits most solo sleepers, although taller or broader adults may feel a little confined. If you sleep alone but like to spread out, the UK small double is 30cm wider at the same length, with a suggested room of 2.4m x 2.8m.
What room size do I need for a single mattress?
We suggest at least 2.1m x 2.8m of floor space, which is our own guidance rather than Silentnight's. That allowance keeps a walkway clear alongside the bed, so in a child's room there's still space for a wardrobe and desk, and in a shared siblings' room two singles can sit with a gap between them.
Is the Silentnight Memory 3 single good for a child's bed?
It's a reasonable fit. Memory foam gives lighter bodies a contoured, cradling feel rather than the firmer push-back of springs, and the single size is the UK default for children's beds. One caveat: Silentnight publishes little construction detail for this model, so parents who want firmness ratings or certifications spelled out may find the information thin.
Can I compare prices on the Memory 3 in a single?
Yes. The prices shown on this page are live and updated as retailers change them, so compare the retailers listed here rather than relying on a figure you saw elsewhere. Singles are usually the cheapest size in any range, which makes this an affordable way into memory foam from a major British brand.