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.
- Fits where other sizes can't: At 90cm wide, this mattress leaves room for a desk, wardrobe or toy storage in bedrooms where every centimetre is already spoken for.
- Firm support for growing sleepers: The firm, no-sink feel suits teenagers and back or front sleeping adults, although lightweight children who sleep on their side may find it slightly unyielding.
- Natural fillings in a child-friendly size: Cotton and eOlus fibre fillings breathe better than dense foam, useful in a small bedroom that warms up quickly overnight.
- Hypoallergenic and vegan certified: For a child prone to allergies, the hypoallergenic certification is a quiet reassurance you don't get from every mattress at this size.
- Cheap, easy bedding: Standard single sheets and a 135 x 200cm duvet fit, and both are the most widely stocked bedding of any UK size.
This size suits you if...
You're furnishing a child's or teenager's room where the bed has to share space with a desk and wardrobe, you sleep alone and want a properly firm feel rather than a sink-in one, or you're setting up a guest room or spare-room office where a 90cm-wide bed keeps the rest of the floor usable. It also suits a first flat or student room where the frame is provided and the mattress isn't.
Consider another size if...
You're an adult who finds 90cm a little restrictive, or anyone else ever shares the bed. We'd recommend the UK small double instead: it's 30cm wider at the same length, and we suggest allowing at least 2.4m x 2.8m for it.
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Will the Hypnos Natural Sanctuary Ortho UK single fit a bunk or mid sleeper frame?
The width and length match standard bunk frames, but check the depth carefully. This mattress is 28cm deep, and many bunk and cabin beds specify a maximum mattress depth so the guard rail still sits safely above the sleep surface. Measure from the base to the top of the rail before ordering.
Is the UK single Hypnos Natural Sanctuary Ortho suitable for a child?
The size is right: the UK single is the standard children's bed size across the UK. The feel needs more thought. This is a genuinely firm mattress, which suits older children and teens who sleep on their back or front, but a lightweight child who sleeps on their side may find it hard on the shoulders and hips.
What room size do I need for a UK single mattress like this?
We suggest allowing at least 2.1m x 2.8m of floor space, which gives you room to walk alongside the bed and open drawers or a wardrobe. That guidance is ours, not the manufacturer's. In a loft conversion, position the 90cm width along the sloped side and the numbers still work.
Is a UK single big enough for an adult?
For one adult, yes, provided you're comfortable with 90cm of width and a 190cm length. Taller sleepers should note the UK king and UK super king run 10cm longer than the UK single. If you spread out in your sleep or ever share, size up before you buy rather than after.
Should I choose the UK small double instead of the UK single?
If the room allows, it's worth considering for an adult sleeping alone. The UK single is 30cm narrower than the UK small double and both are the same length, so you gain shoulder room without losing floor length. We suggest at least 2.4m x 2.8m of floor space for the UK small double.