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.
- Fits where space is tight: At 3ft wide, this single leaves room for a desk, wardrobe and floor space in a child's bedroom or a loft room with a narrow footprint.
- A sensible pick for growing sleepers: The extra firm feel keeps a child or teenager supported as they grow, which means better spinal alignment than a soft mattress they gradually sink into.
- Two can fit in one guest room: Where a spare room hosts visiting family, a pair of UK singles offers flexibility a double cannot, and each measures a manageable 90 x 190cm.
- Pocket springs earn the extra cost at this size: Even at single width, the 1400 Mirapocket springs respond independently, so a restless child or a fidgety guest gets support exactly where their weight lands.
- Memory foam without the sunken feel: The foam top layer cradles pressure points, which matters for a guest of any build sleeping on an unfamiliar bed.
This size suits you if...
You're buying for a child's or teenager's room where the bed shares space with storage and a desk, you're furnishing a spare room or a room that doubles as an office, or you're a single adult in a first flat with a frame already provided. It also suits siblings sharing a room, where two UK singles plus a walkway need every centimetre of the 90cm width saved.
Consider another size if...
You're an adult who spreads out at night, or you're sharing the bed. A UK single leaves no spare width for two, so we'd recommend the UK double instead; allow at least 2.6m x 2.8m of floor space for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Will the Silentnight Memory 1400 UK single fit a bunk or mid sleeper frame?
The 90 x 190cm footprint matches standard UK bunk and mid sleeper frames, but depth is the thing to check. This mattress is 25cm deep, and many raised frames specify a maximum mattress depth so the guard rail stays high enough. Check your frame's stated limit before ordering, particularly for a top bunk.
What room size do I need for a UK single mattress?
We suggest allowing at least 2.1m x 2.8m of floor space for a UK single, which gives you room to walk alongside the bed and open drawers or wardrobe doors. That makes it a practical fit for box rooms, lofts with a narrow usable strip under the slope, and children's rooms already busy with storage.
Is the Silentnight Memory 1400 single a good choice for a child or teenager?
For most, yes. The extra firm feel provides steady support for a growing back, and the 1400 pocket springs adapt as they move through the night. One caution: a lighter child who sleeps mainly on their side may find it slightly hard on shoulders and hips, so a soft sleeper is worth thinking about before you commit.
How much bigger is a UK small double than the UK single?
The UK single is 30cm narrower than the UK small double, and the two are the same length. If you're buying for a teenager who is likely to keep the bed into adulthood, that extra width may be worth having; we suggest at least 2.4m x 2.8m of floor space for the UK small double.
What size is the Silentnight Memory 1400 UK single in feet?
It measures 3ft x 6ft 3in, or 90 x 190cm, the standard UK single size. Standard single fitted sheets and a single duvet fit without adjustment, which keeps bedding cheap and easy to find. If you're replacing a mattress on an existing frame, measure the frame's internal dimensions rather than the old mattress, which may have compressed.