Last seen for £829.63 at Archers Sleepcentre on 26th October 2026
Silentnight Just Sleep Calm Mirapocket 1000 Super King 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
- 90cm each for two sharing: Two people get 90cm each for two people sharing, which means a partner who fidgets or gets up early becomes far easier to sleep through.
- Room for the whole household: When children wander in at 3am or a large dog treats the bed as theirs, this width means nobody ends up clinging to the edge.
- 30cm wider than a UK king: The UK super king is 30cm wider than the UK King and the same length, a difference you feel every single night if you currently share a king.
- Boxed delivery at full size: A flat 180cm-wide mattress is genuinely awkward on stairs and landings, so the rolled, compressed format matters more here than in any smaller size.
- Suits larger bedrooms: In a big master or a period property, a smaller bed can look lost, and this size fills the space properly; we suggest a room of at least 3m x 2.9m.
This size suits you if...
You share the bed every night and want the most sleeping space a standard UK size offers, your partner is restless enough that distance matters more than any comfort layer, or children and pets regularly join you and you'd all still like a fair share. A bedroom of at least 3m x 2.9m makes this size work without crowding the room.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest, or you'd struggle to get a 180cm-wide bed frame past your door swing and landing turns. The UK king would suit you better; allow at least 2.7m x 2.9m for it.
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FAQ's
Should I get the Calm Mirapocket 1000 in a UK king or super king?
If your room and budget allow, the UK super king is the better choice for couples: it's 30cm wider than the UK king, and both are the same 200cm length. We suggest at least 3m x 2.9m of floor space for the UK super king, against 2.7m x 2.9m for the UK king.
How much space does each person get on a super king Calm Mirapocket 1000?
At 180cm across, this size gives 90cm each for two people sharing. That's the same width per person as a UK single, so a restless partner's movement is much less likely to reach your side. It's the main reason couples who've outgrown a double or king trade up to this size.
Is the super king Calm Mirapocket 1000 big enough when children climb in at night?
It's the most forgiving standard size for it. With 180cm of width, a small child arriving in the early hours can settle between you without pushing either adult to the edge. The same applies to a large dog who shares as routine. No mattress makes that comfortable, but this size makes it workable.
Is the boxed format worth having at super king size?
More than at any other size. A flat 180cm-wide mattress is a two-person struggle on a typical UK staircase, and tight landing turns can defeat it entirely. Because the Calm Mirapocket 1000 arrives rolled and compressed, you can carry it to the bedroom before it expands. Still measure your door swing and landing first.
Where can I buy the Calm Mirapocket 1000 in a super king?
Compare the retailers listed on this page; the prices shown are updated as retailers change them. One caution before you order: Silentnight doesn't publish detailed construction figures for this model, so if spring feel or depth matters to you, check the full specification with the retailer first. That advice applies to every size, but the spend is highest here.