Silentnight Memory 1000 Mirapocket Mattress
Mattress
Silentnight Memory 1000 Mirapocket Mattress
Size
Firmness
Firm
Construction
Depth (cm)
25
Layers
2
Layer Details
- Memory Foam Comfort Layer. A responsive memory foam layer that gently moulds to your body's contours, which means pressure points like hips and shoulders get some welcome relief. It absorbs energy as you move, so you feel cradled rather than bounced.
- Mirapocket Spring Support System. 1,000 individually nested pocket springs (counted on the king size, pro-rata for other sizes) that react independently to your body weight and movement. In practice this means zoned support that keeps your spine aligned and limits motion transfer across the bed.
Layer details from silentnight.co.uk product page, September 2026.
- Real room for one sleeper: At 120cm across, the UK small double is 30cm wider than the UK single, so a solo adult can sprawl without paying for space they never use.
- Fits where a double will not: Being 15cm narrower than the UK double often decides whether a box room, studio or loft conversion still has walking space beside the bed.
- Motion isolation matters at this width: The individually nested pocket springs limit movement transfer, useful when two people share 120cm for the occasional night in a guest room.
- Firm feel suits growing sleepers: The firm, spine-aligning support works well for a teenager who has outgrown a single but whose room cannot spare the width of a full double.
- Standard 4ft bedding: Small double fitted sheets are a stocked UK size, so dressing this mattress in a rental or holiday let stays cheap and simple.
This size suits you if...
You sleep alone and want more stretching room than a UK single gives, without the footprint of a full double. Or you're furnishing a compact second bedroom, a loft conversion or a guest room where couples stay occasionally rather than nightly, and 15cm of saved width keeps the room usable.
Consider another size if...
You share the bed every night, because 120cm is snug for two adults 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 room 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.
Is a small double big enough for a teenager?
Yes, and it's a common upgrade. The UK small double is 30cm wider than the UK single but exactly the same length, so a teenager gains real spreading room without the bed swallowing more floor. The firm feel of this mattress also gives growing backs the alignment they need.
Will the Silentnight Memory 1000 small double fit in a box room?
In most box rooms, yes. The mattress measures 120 x 190cm, and we suggest a room of at least 2.4m x 2.8m so you can still open the door and get around the bed. Measure with wardrobes and radiators in mind, since it's the walking space that usually decides it.
Can a couple share the Silentnight Memory 1000 in a small double?
For occasional nights, comfortably enough. The pocket springs react independently to each person's weight, so one sleeper turning over disturbs the other less than you'd expect at this width. For every night, though, two adults on 120cm is a squeeze, and the UK double would serve you better.
How much smaller is the small double than a king size?
The UK small double is 30cm narrower and 10cm shorter than the UK king. That's a meaningful difference: the UK king needs a room of at least 2.7m x 2.9m by our guidance, while the small double works in rooms from 2.4m x 2.8m.
Is this size a good choice for a guest room or holiday let?
It's a sensible one. Guests get a bed that sleeps one adult in comfort or two for a short stay, and the saved width leaves space for a chair or luggage. Bedding is easy: standard 4ft small double fitted sheets with a regular double duvet, both widely stocked in the UK.