Silentnight Memory 1400 Mattress
Mattress
Silentnight Memory 1400 Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
25
Layers
2
Layer Details
- Memory Foam. The top layer moulds to your body as you settle in, which means pressure is eased away from your muscles and joints. You should feel gently cradled rather than pushed back against.
- Mirapocket springs. Beneath the foam sit 1400 Mirapocket springs that respond independently to your every movement. In practice, that means support where you need it and better spinal alignment, with less motion carrying across the bed.
Layer details from silentnight.co.uk product page, September 2026.
- Room to spread out on a firm surface: A firm mattress rewards space, since you settle on top rather than into it, and 120cm of width lets a solo sleeper change position freely.
- Fits where a UK double will not: At 15cm narrower than a UK double, this size can be the difference between a door that clears and one that does not in a box room or studio.
- 1400 springs across a smaller footprint: The Mirapocket springs respond independently to movement, so even at 4ft wide an occasional guest couple will feel less disturbance from each other.
- Memory foam eases the firm feel: The foam top layer moulds to your body, which softens the extra firm support just enough at shoulders and hips as you settle.
- Standard 4ft size, easy to dress: Small double fitted sheets are widely stocked in the UK, and a standard double duvet drapes generously over the 120cm width.
This size suits you if...
You sleep alone and have outgrown a UK single, perhaps a teenager or an adult in a room that cannot spare more floor space, or you're furnishing a guest room, loft conversion or holiday let where couples stay occasionally rather than nightly. The extra firm feel suits you if you sleep on your back or front and want stable support with just a little cushioning on top.
Consider another size if...
You share the bed every night, since 120cm is a squeeze for two on a nightly basis. We'd recommend the UK double instead, which is 15cm wider; allow at least 2.6m x 2.8m of room for it.
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Is a small double big enough for two people on the Silentnight Memory 1400?
For occasional nights, yes. The 1400 Mirapocket springs move independently, so two guests sharing the 120cm width won't jolt each other awake. For nightly sharing it feels tight, and the firm surface means neither of you can sink towards the middle to make room. Regular couples should look at the UK double, which is 15cm wider.
What size room do I need for the Silentnight Memory 1400 small double?
We suggest at least 2.4m x 2.8m. That leaves enough space to walk round the bed and open drawers or a wardrobe. In a loft conversion or box room, the small double's 120cm width often decides whether you keep standing room beside the bed, which a UK double at 135cm can take away.
How much bigger is the small double than the single in this mattress?
The UK small double is 30cm wider than the UK single, and both are the same length at 190cm. That extra width is the whole appeal for a solo sleeper: on an extra firm mattress like this one you lie on the surface rather than in it, so room to move matters more than on a softer bed.
Is the Silentnight Memory 1400 small double a good guest room mattress?
It's a sensible fit. The size handles a single guest generously and a couple for the odd night, and the firm hybrid feel tends to divide people less over a short stay than a very soft mattress would. Lightweight side sleepers may find it a little too firm, so mention that to guests if it applies.
What are the exact dimensions of the small double Silentnight Memory 1400?
It measures 120 x 190cm, or 4ft x 6ft 3in, and the mattress itself is 25cm deep. Because 4ft is a standard UK size, frames, fitted sheets and mattress protectors are easy to find. Most people pair it with small double sheets and a standard double duvet for a fuller drape.