Last seen for £494.42 at Archers Sleepcentre on 26th October 2026
Silentnight Just Sleep Calm Mirapocket 1000 Single Mattress in a Box
The Silentnight Just Sleep Calm Mirapocket 1000 is a mattress in a box from one of the UK's best known sleep brands, delivered rolled and compressed so you can carry it to the bedroom before it expands.
- Boxed for easy carrying upstairs
- Fits most UK bed frames
- From a long-established British maker
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 £725.61 at Archers Sleepcentre on 26th October 2026
Last seen for £651.26 at Archers Sleepcentre on 26th October 2026
Last seen for £829.63 at Archers Sleepcentre on 26th October 2026
Last seen for £494.42 at Archers Sleepcentre on 26th October 2026
Mattress details
Mattress
Silentnight Just Sleep Calm Mirapocket 1000 Mattress in a Box
Size
Firmness
Medium
Construction
Pocket Spring
Rolled
Depth (cm)
Layers
Layer Details
Key benefits
- Fits almost any room: At 90cm wide it needs only around 2.1m x 2.8m of floor space, so it slots into box rooms and awkward layouts with space left over.
- The boxed format suits tight spaces: A compressed single is the easiest mattress there is to carry, useful when the bed sits up a ladder or under a sloped ceiling.
- A sensible children's and teens' choice: The UK single is the default size for kids' frames, so it fits standard children's beds without measuring anxiety.
- Cheap, easy bedding: Single sheets and a standard 135 x 200cm single duvet are the most widely stocked bedding in the UK, so replacements cost little and are never hard to find.
- Works in rooms with two jobs: In a spare room that doubles as an office, a single leaves enough floor free for a desk while still giving guests a proper bed.
This size suits you if...
You're buying for one sleeper: a child moving up from a cot bed, a teenager, a student heading into a first flat where the frame is provided but the mattress isn't, or a guest room where floor space matters. It also suits siblings sharing a room, where two UK singles plus a walkway fit where anything wider wouldn't.
Consider another size if...
You're an adult who shares the bed, or a restless solo sleeper who wants room to spread out. The UK double, which is 45cm wider and the same length, would suit you better; allow at least 2.6m x 2.8m of floor space for it.
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FAQ's
How big is the Calm Mirapocket 1000 in a UK single?
It measures 90 x 190cm, which is 3ft x 6ft 3in. That's the standard UK single, so it fits any standard single frame, and standard single fitted sheets and a 135 x 200cm single duvet fit without adjustment.
Will the UK single Calm Mirapocket 1000 fit a bunk or mid sleeper frame?
The width and length match standard bunk and mid-sleeper frames, so the footprint is fine. Raised frames also have a maximum mattress depth for the guard rail to work safely, and Silentnight doesn't publish full construction details for this model, so confirm the depth with the retailer before ordering.
Is the boxed single easy to get upstairs on my own?
Yes, and this is where the single genuinely helps: a rolled, compressed single is the lightest and most manageable version of any mattress in a box. Carrying it into a loft conversion or up to a cabin bed is a one-person job, then it expands once unrolled in the room.
What room size do I need for a UK single?
We suggest at least 2.1m x 2.8m of floor space. That leaves room to walk around the bed and open a wardrobe, which matters in a child's bedroom where the bed competes with toy storage and a desk. Two singles for sharing siblings need noticeably more, so measure the walkway between them.
Should I buy the UK single or the UK small double for a teenager?
If the room can take it, the UK small double gives a growing teenager 30cm more width at the same length, and we suggest at least 2.4m x 2.8m of floor space for it. In a compact room, the UK single is the safer call, and its bedding is cheaper and easier to find.