Sleepeezee Cosmic 3000 Combination Single Mattress
The Sleepeezee Cosmic 3000 Combination Mattress pairs graphite-infused memory foam with micro and pocket springs under a plush pillow top, which means a soft-feeling surface that works to keep heat away.
- Cooler sleep with graphite foam
- Plush pillow top cushioning
- Supportive edges, no roll-off feeling
£899
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Sleepeezee Cosmic 3000 Combination Mattress
More available sizes
Mattress details
Mattress
Sleepeezee Cosmic 3000 Combination Mattress
Size
Firmness
Construction
Memory Foam
Pocket Spring
Depth (cm)
33
Layers
3
Layer Details
Plush pillow top
A pillow top finished with reinforced edges. It adds cushioning to the surface, and the reinforced edges help the sides feel steadier.
Graphite-infused memory foam
A memory foam infused with graphite, which draws away heat and moisture. That should help you stay cooler through the night.
Micro and pocket springs
Layers of micro and pocket springs, with 3,000 springs in total, though Sleepeezee doesn't give a size. They provide tailored support and cooling comfort underneath the foam.
Layer details from dreams.co.uk product page, November 2026.
Key benefits
- Leaves floor space free: We suggest at least 2.1m x 2.8m for a UK single, which means a wardrobe and a desk can usually share a child's bedroom with the bed.
- Helps warm sleepers stay cooler: Graphite-infused memory foam draws away heat and moisture, which means a teenager who keeps kicking off the duvet should feel a little more comfortable.
- Steadier edges on a narrow bed: The pillow top has reinforced edges, which helps on a 90cm-wide mattress where you lie close to the side most nights.
- Suits a twin guest room: Two UK singles side by side give guests the option of separate beds, and each guest gets the full cushioned pillow-top surface.
- Deep, cushioned feel on a standard frame: Yes, 33cm is deep for a single, but on an ordinary divan or bedstead it gives a cushioned surface without needing a topper.
This size suits you if...
You sleep alone in a compact bedroom, you're furnishing a child's or teenager's room that also has to fit storage and a desk, or you'd rather put two separate beds in the guest room than one double.
Consider another size if...
You like room to stretch out, or a partner sometimes joins you. We'd recommend the UK small double instead, which is 30cm wider; we suggest at least 2.4m x 2.8m of floor space for it.
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FAQ's
Will the Sleepeezee Cosmic 3000 UK single fit a bunk bed or mid sleeper?
Check the frame first. At 33cm deep, this mattress may sit higher than a bunk or mid sleeper's safety rail allows, so look up the frame maker's maximum mattress depth before you buy. On a standard single divan or bedstead, the depth is much less likely to cause a problem.
What size is a UK single Sleepeezee Cosmic 3000 in feet?
The UK single measures 3ft x 6ft 3in, or 90 x 190cm. It's the same length as the UK small double and the UK double, so a tall sleeper gains no legroom from either of those. The UK king is 10cm longer.
Is the Cosmic 3000 in a UK single big enough for an adult?
For one adult who sleeps fairly still, yes. At 90cm wide there's limited room to spread out, and the 190cm length can feel short if you're tall. If you want more width, the UK small double is 30cm wider and the same length.
How much room do I need for a UK single Cosmic 3000?
We suggest at least 2.1m x 2.8m, which leaves you space to walk around the bed and open a wardrobe. In a loft conversion, a UK single often fits under a sloping ceiling, but with 33cm of mattress on top of the frame, check you can still sit up comfortably.
Is the Sleepeezee Cosmic 3000 a good single mattress for a teenager?
It can suit a teenager who runs hot, because the graphite-infused memory foam and the breathable Breeze 3D knit cover are designed to draw heat away. Sleepeezee doesn't publish a firmness, so if your teenager likes a very firm, flat feel, the plush pillow top may not suit them.