Silentnight Healthy Growth Lunar Eco Memory Mattress
Mattress
Silentnight Healthy Growth Lunar Eco Memory Mattress
Size
Firmness
Firm
Construction
Depth (cm)
23
Layers
5
Layer Details
- Quilted sleep surface. A sumptuous quilted sleep surface that is highly breathable, which means it helps regulate body temperature through the night. Silentnight says this promotes a more refreshing sleep.
- Comfort layer. A highly breathable comfort layer sits beneath the quilting. It adds a little cushioning between your child and the fibres below.
- EcoMemory Fibres™. Breathable EcoMemory Fibres™ cocoon the child's body shape as they sleep. You get a gentle, contouring feel without traditional memory foam.
- Miracoil® springs. Miracoil® springs offer head to toe support, which means even support across the whole mattress rather than just the middle. Silentnight states they are scientifically proven to improve spinal alignment and posture.
- Border. A highly breathable border finishes the construction. It allows air to move through the sides of the mattress.
Layer details from silentnight.co.uk product page, September 2026.
- Leaves room for everything else: A child's bedroom has to hold a wardrobe, a desk and toy storage too, and the 90cm width keeps floor space free for all of it.
- Works for shared rooms: Two UK singles plus a walkway fit in most shared siblings' rooms, where anything wider would swallow the space.
- Full length for growth spurts: At 190cm long, this is the same length as a UK double, so a fast-growing teenager won't outgrow it the way they would a shorter children's mattress.
- Standard footprint for raised frames: The 90 x 190cm base matches most bunk, cabin and mid sleeper frames, though check the frame's maximum mattress depth against this mattress's 23cm before buying.
- Cheap, easy bedding: Single sheets and duvets are the most widely stocked bedding of any UK size, so replacing them after spills or growth stages costs little.
This size suits you if...
Your child is ready to move up from a cot or toddler bed to a proper full-size mattress, you need a bed that leaves space for a desk and toy storage in a small room, or you're putting two beds into a room shared by siblings. It also suits a teenager who needs firm support through their growing years without giving up floor space.
Consider another size if...
You need a mattress for a double bed or for an adult's main bed. Silentnight only makes this model in a UK single, so for anything larger you'd need a different mattress entirely.
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What size is the Silentnight Healthy Growth Lunar in a UK single?
It measures 90 x 190cm, or 3ft x 6ft 3in, which is the standard UK single footprint. That means it fits any standard single bed frame, and standard single fitted sheets and a single duvet will fit without adjustment.
Does the Silentnight Healthy Growth Lunar come in any size other than a UK single?
No, the UK single is the only size Silentnight makes for this mattress. That fits its purpose as a children's mattress, since the UK single is the default size for kids' beds, bunks and mid sleepers. If you need a larger size, you'll need to look at a different model.
How much room do I need for a UK single mattress?
We suggest allowing at least 2.1m x 2.8m of floor space for a UK single. That gives you the bed plus enough clearance to move around it, open drawers and change the bedding. In a shared room with two singles, you'll want a clear walkway between the beds as well.
Will the Silentnight Healthy Growth Lunar UK single fit a bunk or mid sleeper frame?
The 90 x 190cm footprint matches most UK bunk, cabin and mid sleeper frames. The thing to check is depth: this mattress is 23cm deep, and raised frames often specify a maximum so the guard rail still sits high enough above the sleep surface. Check your frame's limit before ordering.
Is a UK single big enough for a teenager on this mattress?
Yes for most. At 190cm long it's the same length as a UK double, so height is rarely the issue, and the firm Miracoil springs are designed to support a growing spine. A teenager who wants more width to sprawl would need a bigger size, which this model doesn't offer.