Hypnos Wool Tranquility Mattress
Mattress
Hypnos Wool Tranquility Mattress
Size
Firmness
Construction
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.
- Room for two without dominating the bedroom: At 135 x 190cm, the UK double leaves space for wardrobes and drawers in a typical room, which a UK king often doesn't.
- 67.5cm each for two people sharing: That's enough width for most couples to sleep comfortably, although restless pairs or broad-shouldered sleepers may want more.
- Pocket springs limit partner disturbance at this width: The 1400 ReActive 8-turn springs respond independently, which matters more in a shared double where you're sleeping closer together.
- Wool and cotton keep two sleepers cooler: Two bodies raise the temperature under one duvet, so the moisture-wicking natural fibres do more useful work in a shared UK double.
- Easy to dress and easy to fit: Double sheets and 200 x 200cm duvets are stocked everywhere, and this size suits guest rooms as well as main bedrooms.
This size suits you if...
You share the bed every night and your bedroom is a typical UK size, you're furnishing a guest room that needs to sleep visiting couples comfortably, or you sleep alone and want space to spread out, perhaps with a dog or cat claiming a corner. Allow at least 2.6m x 2.8m of floor space, with around 3m x 3m the comfortable norm.
Consider another size if...
You're a couple with the room to go bigger, or one of you is a restless sleeper and 67.5cm each feels tight. We'd recommend the UK king instead; allow at least 2.7m x 2.9m for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is the Hypnos Wool Tranquility UK double big enough for a couple?
For most couples, yes. You get 67.5cm each for two people sharing, and the 1400 pocket springs respond independently, so one person turning over is less likely to wake the other. If either of you is tall, remember the UK double is 190cm long; the UK king adds 10cm of length as well as width.
What size room do I need for the UK double Hypnos Wool Tranquility?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That tighter minimum still leaves walking space on both sides, but if you want bedside tables on both sides plus a wardrobe, measure carefully before committing. In a first flat or second bedroom, the UK double usually fits where a UK king wouldn't.
Should I choose the Hypnos Wool Tranquility in a UK double or a UK king?
It comes down to your room. The UK double is 15cm narrower and 10cm shorter than the UK king, and needs less floor space: we suggest 2.6m x 2.8m for the UK double against 2.7m x 2.9m for the UK king. Couples with the space often prefer the UK king; in a typical bedroom, the UK double is the sensible pick.
Will the UK double version fit up narrow stairs?
It's delivered flat rather than rolled, so a 135 x 190cm mattress has to make every turn in one piece. That's usually fine, but in an older terrace with a tight turning staircase, or a new build with a narrow landing, measure the awkward points first. A pocket sprung mattress will flex a little, but don't rely on it folding.
Is a UK double a good choice for one person?
Yes, and it's a genuine upgrade from a UK single: the UK double is 45cm wider at the same length. That's plenty of room to spread out, or to share with a pet that insists on its own corner. If your room is on the small side, the UK small double, which is 15cm narrower, needs only 2.4m x 2.8m.