Last seen for £575 at Silentnight on 9th September 2026
Silentnight Just Sleep Dream King Size Mattress
The Silentnight Just Sleep Dream is a 27cm hybrid mattress combining 1000 zoned Mirapocket springs with high-density ReVo foam and a memory foam feel.
- Softer feel with zoned support
- Open-cell foam sleeps cooler
- 365-night trial & 10-year guarantee
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 £575 at Silentnight on 9th September 2026
Last seen for £480 at Silentnight on 9th September 2026
Last seen for £700 at Silentnight on 2nd September 2026
Mattress details
Mattress
Silentnight Just Sleep Dream Mattress
Size
Firmness
Medium Soft
Construction
Foam
Pocket Spring
Hybrid
Rolled
Memory Foam
Depth (cm)
27
Layers
4
Layer Details
Vitalize sleep surface
Silentnight says its Vitalize technology absorbs body heat and reflects lost energy back into the body, with claimed benefits for circulation. In practical terms, this is the soft-knit surface you'll feel first.
High-density ReVo™ foam
An open-cell foam that lets air circulate, which means less of the heat build-up memory foam is known for. Its high density also gives closer body support beneath the softer surface.
Pocket springs
1000 zoned Mirapocket springs sit at the core, each moving independently so your partner's movement is less noticeable. The zoning gives firmer support under heavier areas like the hips for better spinal alignment.
Foam Encapsulated border
A supportive foam wall runs around the base and sides, which means you can sleep right to the edge without that rolling-off feeling. It also helps the mattress keep its shape over time.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- Room to sleep softly without touching: A Medium/Soft feel invites you to spread out, and 75cm each for two people sharing means you can do exactly that without meeting in the middle.
- Zoned springs matter more at this width: The 1000 zoned Mirapocket springs move independently, so an early-riser partner slipping out at 6am is far less likely to wake you across a UK king.
- Extra length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK Double, which means anyone nearing 6ft stops sleeping with feet at the edge.
- Edges you can actually use: The foam-encapsulated border firms up the sides, so sleeping near the edge of your half feels stable rather than precarious, useful when a dog claims the middle.
- Cooler than memory foam usually feels: The open-cell ReVo foam lets air move through it, and on a softer mattress you sink in slightly more, so that airflow genuinely helps.
This size suits you if...
You share the bed every night and a double has started to feel cramped, you or your partner keep different hours and want movement to go unnoticed, or one of you is approaching 6ft and needs the 200cm length. It also suits couples where one person shifts position often, during pregnancy for instance, since the softer surface and zoned springs absorb the fidgeting.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king. In that case we'd recommend the UK double instead: it's 15cm narrower and 10cm shorter, and we suggest at least 2.6m x 2.8m for it.
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FAQ's
Is a UK king big enough for a couple on the Silentnight Just Sleep Dream?
Yes, comfortably for most. You get 75cm each for two people sharing, and because this mattress is Medium/Soft you sink in slightly rather than rolling toward the middle, helped by the foam-encapsulated border at the sides. If one of you sprawls, or a dog joins you most nights, the UK super king adds another 30cm of width.
Will a king size Just Sleep Dream stop me feeling my partner move?
It should reduce it noticeably. The 1000 Mirapocket springs move independently, so one person getting up early transfers less motion, and the width of a UK king means you're rarely close enough to feel what does come through. It's a sensible pick for couples on different schedules.
Is the Silentnight Just Sleep Dream UK king long enough for tall sleepers?
At 200cm, the UK king is 10cm longer than the UK Double, which is often the difference between feet hanging off the end and not. If either of you is around 6ft or over, that extra length is arguably a bigger upgrade than the width.
What room size do I need for this mattress in a UK king?
We suggest at least 2.7m x 2.9m, with more feeling comfortable once wardrobes and bedside tables go in. New build master bedrooms can be tighter than they first appear, so measure with furniture in mind. If the room won't stretch to it, the UK double needs at least 2.6m x 2.8m.
Where can I buy the Just Sleep Dream in a UK king?
Compare the retailers listed on this page. The prices shown here are live and updated as retailers change them, so it's worth checking back if you're not buying today. Remember it's only made in UK double, UK king and UK super king, so stock is spread across fewer sizes than most Silentnight ranges.