Firmness
Type
Pocket Spring
Depth (cm)
28
Number of Layers
4
Trial Period (nights)
Warranty (years)
5
Price Range
£649 to £1,349
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
Choose this one if you sleep hot or sleep on your back or front and want proper firm support with natural materials rather than memory foam. The cotton and eOlus fibre fillings wick away moisture, which means less of that clammy feeling foam mattresses can cause. The 1200 pocket springs move independently, so a restless partner is less likely to disturb you. Yes, the firmness will feel unforgiving to some, but for heavier sleepers or anyone who finds soft mattresses leave them with a stiff back, that firmness is the point. The size range is unusually wide, running from small single through Emperor, plus EU sizes.
Key Features & what's inside
- 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.
Who's it NOT for?
This is a genuinely firm mattress, so lightweight side sleepers will likely find it too hard on the shoulders and hips. If you like a sink-in, cradling feel, look at memory foam or hybrid options instead. And if you want a long in-home trial before committing, check the retailer's returns terms first, as no trial period is listed.
Hypnos Natural Sanctuary Ortho Mattress
View all mattresses
Is the Hypnos Natural Sanctuary Ortho mattress firm or soft?
It's rated firm. That suits back and front sleepers, heavier sleepers, and anyone who prefers to lie on top of a mattress rather than sink into it. Lightweight side sleepers may find it slightly too firm for comfortable pressure relief.
How many springs does the Hypnos Natural Sanctuary Ortho have?
It has 1200 ReActive 7-turn pocket springs. Each spring works independently, which means the mattress adapts to your body's shape and reduces the ripple effect when a partner moves.
Does the Hypnos Natural Sanctuary Ortho come with a guarantee?
Yes, it comes with a 5-year Hypnos manufacturer guarantee. No trial period is stated on the retailer listing we sourced, so check returns terms with your retailer before buying.
Is the Hypnos Natural Sanctuary Ortho vegan friendly?
Yes, it's certified vegan friendly, which is unusual for a natural-filling mattress. It's also hypoallergenic and meets the BS7177: 2008 fire resistance standard, and the cotton filling is sustainably sourced.
What sizes does the Hypnos Natural Sanctuary Ortho come in?
It's available in UK Small Single, Single, Small Double, Double, King, Super King and Emperor, plus EU Single, EU Double and EU King. Prices range from £649 to £1,349 depending on size.
Couldn't find an answer to your question? Send us a message