Last seen for £651.26 at Archers Sleepcentre on 26th October 2026
Silentnight Just Sleep Calm Mirapocket 1000 Double 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
- The classic couples' footprint: At 135 x 190cm, the UK double gives a couple a shared bed without dominating an average sized room.
- 67.5cm each for two sharing: Two people sharing get 67.5cm each, enough for most couples, although restless sleepers may feel the limit.
- Fits most UK bedrooms: We suggest a room of at least 2.6m x 2.8m, which leaves space for a wardrobe and drawers in a typical second bedroom or first flat.
- Boxed delivery suits awkward access: The compressed, rolled format turns the tight corners of older terraced staircases and narrow new build landings far more easily than a flat mattress would.
- Bedding is easy and cheap to find: Double sheets and duvets are stocked everywhere at every price, useful if you're kitting out a whole home at once.
This size suits you if...
You share the bed every night and your room sits comfortably above our suggested 2.6m x 2.8m minimum, you're furnishing a first flat or second bedroom where the bed has to leave space for other furniture, or you're setting up a guest room that visiting couples will use.
Consider another size if...
You and your partner both want more than 67.5cm of width each and your room can take a bigger bed. The UK king is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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FAQ's
Is the UK double Calm Mirapocket 1000 big enough for a couple with bedside tables?
The mattress itself is 135cm wide, giving two sharers 67.5cm each. Whether the room copes with tables on both sides depends on your floor space: we suggest at least 2.6m x 2.8m for a UK double, and a little more if you want a table and walking room on each side.
Will the boxed UK double fit up a narrow staircase?
This is where the boxed format helps. The mattress arrives compressed and rolled, so it can be carried around turning stairs in older terraces or across tight new build landings far more easily than a flat double. Silentnight doesn't publish the boxed dimensions, so check with the retailer if your access is genuinely tight.
Should I get this mattress in a UK double or a UK king?
The UK double is 15cm narrower and 10cm shorter than the UK king. If you share every night and the room allows at least 2.7m x 2.9m, the UK king gives each of you noticeably more space. In a smaller room, the UK double keeps space free for wardrobes and drawers.
Is a double a good size for a guest room?
Yes, it's the sensible guest room choice: visiting couples can share it, solo guests get room to spread out, and at 135 x 190cm it fits most spare rooms alongside a wardrobe. Double bedding is also the easiest to buy spares of, which matters when you're washing sheets between visits.
What are the UK double dimensions in feet and inches?
The UK double measures 4ft 6in x 6ft 3in, which is 135 x 190cm. It's the same length as the UK single but 45cm wider, so if you're upgrading from a single the bed grows sideways only, and your room needs width rather than extra length to take it.