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.
- The classic shared footprint: At 135 x 190cm, the UK double is the long established size for two, fitting rooms where a UK king would crowd the walls.
- Firm support for both of you: The 1200 ReActive 7-turn pocket springs respond to each sleeper independently, which means one of you turning over is less likely to wake the other.
- Room for bedside tables: In a room of 2.6m x 2.8m or more, the UK double usually leaves space for a table on each side, something a wider bed can rule out.
- Easy to move in: A 135cm wide mattress is one of the more manageable sizes to carry up a turning staircase in an older terrace or a tight new build landing.
- Bedding without the hunt: Double sheets and 200 x 200cm duvets are stocked everywhere at every price, so dressing this size costs less effort and money than the larger options.
- Breathable at close quarters: Two people sharing raises the temperature under the duvet, and the cotton and eOlus fibre fillings wick moisture away rather than trapping it like foam.
This size suits you if...
You share the bed every night and want the traditional couples' size that leaves your room usable, or you sleep alone and like space to spread out. It also suits a guest room that regularly hosts visiting couples, and it works well if you sleep on your back or front and want the firm, no-sink feel this mattress delivers in a footprint most UK bedrooms take comfortably.
Consider another size if...
You both need more elbow room than 67.5cm each, or one of you is a broad shouldered side sleeper. We'd recommend the UK king instead, which is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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Is a UK double Hypnos Natural Sanctuary Ortho big enough for two adults?
For most couples, yes. The UK double gives 67.5cm of width each for two people sharing, and the 1200 pocket springs move independently, so you feel less of your partner's movement. If either of you is tall or a sprawler, the UK king adds 15cm of width and 10cm of length.
What room size do I need for the Hypnos Natural Sanctuary Ortho in a UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. The mattress itself is 135 x 190cm, so in a typical UK bedroom you should still fit a wardrobe, a chest of drawers and bedside tables on both sides without the bed dominating the space.
Should I choose the UK double or the UK small double for this mattress?
For a couple, the UK double. The UK double is 15cm wider than the UK small double, and on a firm mattress like this you'll notice that extra elbow room. The UK small double suits a solo sleeper in a compact room, and needs at least 2.4m x 2.8m of floor space.
Will a UK double fit up a narrow staircase?
Usually, and more easily than the larger sizes. At 4ft 6in x 4ft 6in wide by 6ft 3in long, a UK double is one of the more manageable sizes to turn on the stairs of an older terrace or a tight new build landing. Measure the awkward turn before ordering all the same.
Is this size a good choice for a guest room?
A sensible one. The UK double comfortably sleeps visiting couples, fits most spare rooms, and double bedding is cheap and easy to find. The firm feel suits back and front sleepers best, so the occasional side-sleeping guest may find it a little unyielding, but for a bed used now and then that's a fair trade.