I'm melting on my mattress in this heat – could this cooling and adjustable alternative (currently $300 off) be the solution?

The Sleep Number C4 mattress is one of the smartest beds you can buy, adapting to your body temperature and position for a restful night's sleep

Green and blue themed bedding
(Image credit: Future)

Don't get me wrong, my current mattress has served me well over the years, with its memory foam layer to minimize movement, so myself and my husband don't disturb each other during the night (he's a restless sleeper). But the top layer has become pilled and is slightly sagging which creates ridges under my sheets. I've also found it to be very warm (even on cool nights), and it's no longer as supportive as it was when new, which is causing me to wake with aches and pains on a regular basis.

With that in mind, I've had my eye on some of the best mattresses and been pondering which are worth parting with (quite a lot of) cash for. After all, mattresses are a substantial purchase, and you want them to last, so choosing well is crucial for long-lasting quality sleep.

So, when I heard about Sleep Number's smart beds I wondered if their cooling and customisable mattresses could be the answer to my night-time woes. And, with the premium C4 mattress currently on sale with $300 off, I'm seriously considering making the switch.

Why I'm considering the Sleep Number c4 mattress

Sleep Number c4 mattress
Smart choice
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Sleep Number c4 mattress: was $2,399 now $2,099 at Sleep Number

Even without the decent $300 off, there's a lot to like about this mattress, from its variable firmness options, cooling ability, and Responsive air® technology, which means it responds to your movements as you sleep.

While Sleep Number didn't make this cut in our best mattresses round-up, our former Sleep Editor, Emilia Hitching, did rate their products, saying 'Sleep Number is one of the best places to buy bedding for hot sleepers,' and she had particularly been eyeing up the mattresses for review to see how they performed against competitors.

Benefitting from adjustable firmness levels for each side – ideal if you and your partner have different sleep styles – and a ceramic cooling gel which draws away heat to actively cool you down as you sleep, Sleep Number mattresses certainly sound like a smart choice. They also feature Responsive air® technology, which means the mattress contours to your body shape, responding to your movements throughout the night. Clever stuff.

The mattresses come in at a range of price points, from around $1,500 to $12,700, so it can be hard to know how much it's worth spending. Personally, I was pleased to find the Sleep Number C4 mattress is part of the classic series, at the more affordable end of the scale, which feels like a good place to start, particularly if you don't have any chronic sleep problems. I'm lucky that I'm generally a good sleeper, but I do often wake with back ache and run hot on my current mattress.

The Sleep Number C4 mattress is the most premium in the classic range, offering superior cooling and pressure relief, with the maximum support level. One recent review said: 'Just got our C4 and it’s much better than the store-bought mattress we had. Finally have support and adjustable firmness.'

So, if, like me, you're looking for a premium product, without spending a fortune, and your priorities for sleep are support and cooling, this looks like a pretty sweet sale deal.

Complete your cooling sleep set-up with these sheets pillows and toppers.

Shop other cooling bedding


If you run warm at night, you'll want to consider some of the best Amazon cooling sheets, which also have good deals on for Amazon Prime Day at the moment. And you can complete your cool bed set up with some of the best pillows, for everything from neck pain to side sleepers.

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Katrina Harper-Lewis
Head of Living

Katrina is Head of Living at Homes & Gardens, covering hosting and entertaining, seasonal styling ideas, sleep and wellbeing, along with a highly experienced team of writers and reviewers. With more than 15 years' experience in lifestyle content, Katrina was previously an editor at luxury lifestyle platform, Muddy Stilettos, has been a features writer at Sainsbury's magazine and has also written for a wealth of other food and lifestyle titles including Ideal Home, Waitrose Food, John Lewis' Edition and The Home Page. Katrina is passionate about heritage style and lives in a 100-year old cottage in rural Hertfordshire, where she enjoys finding creative ways to live and host stylishly.

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