Hypnos Natural Sanctuary Ortho Mattress
Mattress
Hypnos Natural Sanctuary Ortho Mattress
Size
Firmness
Construction
Depth (cm)
28
Layers
4
Layer Details
- Viscose Blend Breathable Sleep Surface. A soft viscose blend cover that promotes airflow, which means the sleep surface stays cooler and fresher through the night. It is the first thing you'll feel, and it softens the firm feel slightly.
- eOlus™ Fibres. These fibres offer resilient body support while letting air and moisture pass through easily. In practice, that means cushioning that springs back rather than trapping heat the way dense foam can.
- Sustainably Sourced Cotton. Natural cotton fibres are highly breathable and wick away excess moisture. If you're a hot sleeper, this is the layer doing much of the quiet work.
- ReActive™ 7-Turn Pocket Springs. Hypnos's ReActive 7-turn pocket spring system uses 1200 individually responsive springs that work independently to adapt to your body's shape. That means support that follows your spine rather than pushing back as one flat unit, and less motion transfer between partners.
Layer details from mattressnextday.co.uk product page, September 2026.
- Room to sleep apart, together: At 15cm wider than the UK double, this king gives each of you space to settle without negotiating over the middle.
- Less disturbance across a wider bed: The 1200 pocket springs move independently, and across 150cm of width there's simply more mattress between you and a restless partner.
- Length for taller sleepers: The 200cm length is 10cm more than the UK double offers, which means anyone approaching 6ft stops sleeping with their feet at the edge.
- Firm support that doesn't roll you together: A firm pocket sprung surface keeps each sleeper on their own side rather than dipping towards the heavier partner, useful at this shared width.
- Breathable at a shared size: Two people generate more heat than one, and the cotton and eOlus fibre fillings let moisture escape rather than trapping it the way foam can.
This size suits you if...
You share the bed every night and a UK double has started to feel like a compromise, one of you is tall enough to appreciate the 200cm length, or you sleep on different schedules and want a firm, low-motion surface wide enough that one person getting up at 5am doesn't wake the other.
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 of floor space.
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Is a UK king big enough for a couple on this firm a mattress?
Yes, comfortably for most couples. You get 75cm each for two people sharing, and the firm surface actually helps here: neither of you sinks into a dip that pulls you together. Lightweight side sleepers may still find the feel a little unyielding, but that's true of every size of this mattress, not the king specifically.
Will the UK king reduce partner disturbance compared with a double?
It should, for two reasons. The 1200 ReActive pocket springs respond individually, so movement doesn't travel across the bed as one unit. And the king is 15cm wider than the UK double, which puts more distance between you. If one of you leaves for work hours before the other, that combination makes a real difference.
Is the Hypnos Natural Sanctuary Ortho UK king long enough for someone over 6ft?
At 200cm long (the full size is 5ft x 6ft 6in), it gives taller sleepers 10cm more length than the UK double. For anyone around or above six foot, that extra length is often the upgrade they actually feel, more than the width. Feet stay on the mattress rather than hanging over a firm edge.
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 the furniture in place. If the maths doesn't work, the UK double needs at least 2.6m x 2.8m and still suits most couples.
Should I get this mattress in a UK king or a UK super king?
The UK king suits most couples: proper personal space without dominating the room. The UK super king is 30cm wider, the same length, and needs at least 3m x 2.9m of floor space. If a pet routinely claims part of the bed, or you simply want maximum room, that extra width is where the UK super king pays off.