Silentnight Memory 1400 Pocket Mattress
Mattress
Silentnight Memory 1400 Pocket Mattress
Size
Firmness
Construction
Depth (cm)
25
Layers
2
Layer Details
- Memory Foam. A memory foam layer that moulds to your body, which means pressure is eased from muscles and joints as you settle in. Expect a gentle cradle rather than a deep sink, given the firm overall feel.
- Mirapocket Springs. 1400 Mirapocket springs sit beneath the foam, each responding independently to your movement. In practice that means targeted support along your spine and less motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
- Room to spread out alone: At 120cm across, this size is 30cm wider than the UK single, so a solo sleeper can shift position freely without meeting the edge.
- A double feel in a smaller room: It is 15cm narrower than the UK double, which can be the difference between a door that clears the bed frame and one that doesn't.
- Firm support across the full width: The 1400 Mirapocket springs respond independently, so support stays consistent whether you sleep centred or drift towards one side of the 4ft width.
- Works for the occasional shared night: Two people can manage it now and then, and the pocket springs limit motion transfer when a guest room hosts a couple for a weekend.
- Standard 4ft bedding and frames: The small double is an established UK size, so fitted sheets and bases are easy to find, and its 25cm depth suits standard sheets.
This size suits you if...
You sleep alone and want noticeably more width than a single, perhaps a teenager or an adult in a room where every centimetre of floor matters. It also suits a box room, loft conversion or small second bedroom where a full double would crowd the space, or a guest room that hosts a couple occasionally rather than every night. The firm feel favours back and front sleepers.
Consider another size if...
You share the bed every night, because two adults on 120cm is a squeeze long term. We'd recommend the UK double instead, which is 15cm wider and the same length; allow at least 2.6m x 2.8m of floor space for it.
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Is a small double Silentnight Memory 1400 big enough for a couple?
For occasional nights, yes. At 120cm wide it gives two adults noticeably less space than a standard double, so it works well in a guest room hosting couples for a weekend. The 1400 Mirapocket springs help by moving independently, so one person turning over disturbs the other less. For nightly sharing, we'd suggest sizing up to the UK double.
What room size do I need for a small double Memory 1400?
We suggest allowing at least 2.4m x 2.8m. The mattress itself is 120 x 190cm, and that room guidance leaves space to walk round the bed and open drawers or a wardrobe. It makes the small double a realistic option for box rooms, loft conversions and studio flats where the UK double, which needs at least 2.6m x 2.8m, would dominate.
Should I get the Memory 1400 in a small double or a double?
The UK small double is 15cm narrower than the UK double and the same length. If you sleep alone, the small double gives you generous space while keeping floor area free. If a partner joins you regularly, the extra 15cm of the UK double is well spent. Room size often decides it: measure before you choose.
How much wider is a small double than a single for this mattress?
The UK small double is 30cm wider than the UK single, and both are the same length at 190cm. That extra width matters on a firm mattress like this one, because you sit on the surface rather than sinking in, so restless sleepers use more of the bed. It suits a teenager or adult who has outgrown a single.
Does the firm feel of the Memory 1400 matter more in a small double?
Slightly, yes. With 120cm to yourself the firmness rarely causes problems, since you can adjust position easily. If two of you share it occasionally, each person has less width, and lighter side sleepers may notice pressure at the shoulder sooner. For regular couple use, the UK double gives each sleeper more room to settle comfortably.