Last seen for £639 at Silentnight on 2nd September 2026
Silentnight Just Sleep Bliss King Size Mattress
The Silentnight Just Sleep Bliss is part of Silentnight's Just Sleep bed-in-a-box collection.
- Medium-firm feel with cushioning
- Absorbs movement, so less disturbance
- Breathable open-cell structure
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 £489 at Silentnight on 2nd September 2026
Last seen for £639 at Silentnight on 2nd September 2026
Last seen for £579 at Silentnight on 2nd September 2026
Mattress details
Mattress
Silentnight Just Sleep Bliss Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
Layers
Layer Details
Key benefits
- Proper space for two: At 75cm each for two people sharing, you can both turn over without negotiating, which matters most for couples who've outgrown a double.
- Less partner disturbance: The UK king is 15cm wider than the UK double, so an early alarm on one side is less likely to travel across to the other.
- Extra length for taller sleepers: The 200cm length gives you 10cm more than the UK double, a genuine relief if either of you is approaching six foot.
- Room for real life: A dog who treats the bed as home, or months of pregnancy pillows, take up less of your share on a 150cm width.
- Standard king bedding: The 5ft x 6ft 6in footprint takes ordinary UK king sheets and duvets, so there's no hunting for odd sizes.
This size suits you if...
You share the bed every night and a double has started to feel cramped, especially if you're on different schedules and one of you gets up hours before the other. It also suits you if either partner is tall, since the 200cm length is the upgrade you'll actually feel, or if a pet or a small child regularly joins you and 135cm no longer stretches to everyone.
Consider another size if...
Your bedroom is smaller than the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. In either case we'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Silentnight Just Sleep Bliss king big enough for a couple?
Yes, comfortably for most. The UK king measures 150 x 200cm, which gives 75cm each for two people sharing. That's 15cm more width than the UK double, enough that one of you shifting position or getting up early is far less noticeable to the other.
What room size do I need for the Just Sleep Bliss in a UK king?
We suggest allowing at least 2.7m x 2.9m. That leaves room to walk around the bed and open drawers or wardrobe doors. In a new build master bedroom, measure with the wardrobes in place before deciding: these rooms often feel smaller once the furniture is in.
Does the UK king suit a tall sleeper?
It's the sensible choice. The UK king is 10cm longer than the UK double as well as 15cm wider, and that extra length stops feet hanging over the end for anyone approaching six foot. If height is your only concern, length rather than width is the upgrade you're paying for here.
Should I go for the UK king or size down to the UK double?
If your room meets our suggested 2.7m x 2.9m minimum and two of you share the bed, the UK king is the better long-term buy for the extra personal space. If the room is tight, the UK double needs slightly less at 2.6m x 2.8m and this mattress is also available in that size.
Where can I buy the Silentnight Just Sleep Bliss in a UK king?
Availability changes, so the most reliable answer is the live pricing on this page: compare the retailers listed here, as the prices shown are updated as retailers change them. Silentnight publishes little detail on this model's construction, so check the retailer's own listing for specifics before you order.