Silentnight Just Sleep Serene Mattress
Mattress
Silentnight Just Sleep Serene Mattress
Size
Firmness
Construction
Depth (cm)
Layers
Layer Details
- 90cm of width each: Two people sharing get 90cm apiece, which means a partner who turns over all night is far enough away to sleep through.
- Room for night-time visitors: At 180cm wide there's still a fair share for everyone when a child wanders in at 3am, or a large dog treats the bed as routine.
- The biggest standard UK size: At 6ft x 6ft 6in this is as much mattress as mainstream retailers stock, so you're at the ceiling of sleeping space without going bespoke.
- 30cm wider than a UK king: The UK super king adds 30cm of width over the UK king at the same length, which is where the undisturbed-sleep difference actually comes from.
- Suits a large master bedroom: In a period property or generous new build master, a smaller bed can look lost, and this footprint sits in proportion with the room.
This size suits you if...
You share the bed every night with a partner who shifts, turns or steals the duvet, and distance matters more to you than any comfort layer could. Or your household treats the bed as communal, with children or a dog joining regularly. Your bedroom should clear our suggested 3m x 2.9m minimum, ideally with space to spare.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest, or you'd rarely use the extra width. We'd recommend the Just Sleep Serene in a UK king instead, which is 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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.
How much space do two people get on the Silentnight Just Sleep Serene super king?
You get 90cm each for two people sharing, across a total footprint of 180 x 200cm, or 6ft x 6ft 6in. That per-person width matches a UK single, so each of you effectively has your own bed's worth of space. It's the size we'd point restless couples towards first.
Is the Just Sleep Serene super king worth it over the UK king?
The UK super king is 30cm wider than the UK king, and the two are the same length. If one of you sleeps lightly and the other moves a lot, that extra width does more for you than any mattress upgrade would. If your room is under 3m wide, though, the UK king is the sensible pick.
Will the Silentnight Just Sleep Serene super king fit my bedroom?
We suggest allowing at least 3m x 2.9m so you can still open drawers and walk around the bed. Measure the route in too: door swings and tight landing turns catch people out at this size more than any other. In a loft conversion, the slope usually decides which wall the bed can take.
Is the super king a good family size for this mattress?
It's the size we'd suggest if children regularly appear in the night or a large dog shares as standard. At 180cm wide, everyone keeps a workable share rather than one adult being edged onto the border. It's a lot of bed to dress, and super king bedding costs more, but for shared sleeping it's the practical choice.
Where can I buy the Silentnight Just Sleep Serene in a UK super king?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them. Since construction detail for this model is limited, read the retailer's listing carefully for firmness and materials before ordering, particularly at this size, where returning a mattress is a bigger job.