Hypnos Wool Tranquility Single Mattress
The Hypnos Wool Tranquility is a medium firm pocket sprung mattress built around natural fibres: sustainably sourced British wool and cotton over 1400 of Hypnos's ReActive 8-turn pocket springs.
- Less clammy than all-foam beds
- Hips sink in, shoulders stay supported
- Suits back & combination sleepers
£679
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Hypnos Wool Tranquility Mattress
More available sizes
Mattress details
Mattress
Hypnos Wool Tranquility Mattress
Size
Firmness
Medium Firm
Construction
Wool
Depth (cm)
29
Layers
5
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.
Sustainably Sourced British Wool
British wool gives gentle cushioning with impressive resilience. In practice that means a comfort layer that keeps its shape rather than developing body impressions quickly.
Sustainably Sourced Cotton
Natural cotton fibres are highly breathable and wick away excess moisture. You'll feel this as a cooler, drier surface, particularly useful if you tend to overheat.
eOlus™ Fibres
These fibres offer a soft, foam-like feel while letting air and moisture pass through easily. You get the comfort of foam without the heat retention it's often criticised for.
ReActive™ 8-Turn Pocket Springs
The base is 1400 individually responsive pocket springs, each with 8 turns, engineered for total spinal and body support. Each spring senses and adjusts independently, so movement on one side of the bed is less likely to disturb the other.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Fits almost any room: At 90cm wide it slots into small bedrooms and loft conversions; we suggest allowing at least 2.1m x 2.8m of floor space.
- Cooler for warm little sleepers: Wool and cotton wick moisture naturally, which means a child or teen who runs hot is less likely to wake up clammy.
- Full spring count in a small size: The 1400 ReActive 8-turn pocket springs respond to one body without a partner's weight in play, so support stays even across the whole surface.
- Hypoallergenic natural fill: The hypoallergenic wool and cotton construction is a reassuring choice for a child's bed or a guest room used by different sleepers.
- Substantial for a spare room: It arrives flat rather than rolled and stands 29cm deep, so a guest bed feels like a proper bed rather than an afterthought.
This size suits you if...
You're buying for one sleeper who needs proper support in a small footprint: a child or teenager whose bed shares the room with a desk and wardrobe, a spare room that doubles as an office, or a first flat where the frame came with the tenancy but the mattress didn't. The medium firm feel suits a growing sleeper better than something they'd sink into.
Consider another size if...
Your sleeper has room to spread out, or two of you will ever share the bed. We'd recommend the UK double instead: it's 45cm wider than the UK single and the same length, and we suggest at least 2.6m x 2.8m of floor space for it.
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FAQ's
Is the Hypnos Wool Tranquility UK single a good mattress for a child?
It suits children and teens well. The medium firm tension supports a growing sleeper rather than letting them sink, the wool and cotton fill is hypoallergenic, and it meets the BS7177 fire safety standard. Lighter children may find it slightly firm at first, though the eOlus fibre layer softens the surface feel.
Will the UK single Hypnos Wool Tranquility work on a bunk or mid sleeper frame?
The 90 x 190cm footprint matches standard UK bunk and mid sleeper frames, but this mattress is 29cm deep, which is deeper than many bunks are designed for. Check your frame's maximum mattress depth and guard rail height before buying, particularly for a top bunk.
What room size do I need for the Hypnos Wool Tranquility in a UK single?
We suggest allowing at least 2.1m x 2.8m of floor space. That leaves room to walk around the bed and open drawers or a wardrobe, which matters in a child's room where the bed competes with toy storage and a desk, or in a loft room with a narrow usable footprint.
How much bigger is the next size up from the UK single?
The UK single is 30cm narrower than the UK small double and 45cm narrower than the UK double, and all three are the same length. For a teenager who has outgrown a single but stays in the same room, the UK small double is a good middle step; we suggest at least 2.4m x 2.8m for it.
Where can I buy the Hypnos Wool Tranquility in a UK single?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so what you see reflects current availability for this size rather than the mattress range as a whole. It's delivered flat rather than rolled, so plan the route to the bedroom before ordering.