Best mattress deals UK September 2025: Save big on Emma, Dusk and Silentnight

You can sleep better for less this September.

With post–Bank Holiday price cuts and early‑autumn clearances landing, it’s a great moment to grab a top‑rated mattress and get cosy for the cooler nights ahead.

Getty

Emma, Dusk and Silentnight all have strong offers on best‑sellers right now, and I’ve done the legwork to surface the genuine, editor‑approved savings from retailers we trust — no inflated RRPs, no waffle.

The smart move is buying for how you sleep: side sleepers who want plush pressure relief, restless toss‑and‑turners who need stronger motion isolation, or anyone chasing firmer, back‑supporting comfort to help with aches and pains.

Still running hot after a sticky summer? I’ve flagged the most breathable, temperature‑regulating mattresses and cooling pillows to keep you comfortable as nights start to cool.

So if you’re ready to save on the best mattresses, below you’ll find the standout September 2025 deals worth your attention, plus quick tips on firmness, materials (foam vs hybrid), trial periods, delivery and returns — and how to spot extra voucher codes or freebies — so you can check out with confidence.

We have based prices on double-sized mattresses. 

5 best mattress deals this September at a glance:

1. Simba Hybrid Ultra Mattress: save £506 – buy here
2. Dusk Memory Foam 4000 Pocket Sprung Hybrid Mattress, get a mystery discount with code REVEAL – buy here
3. Grantham Ortho Backcare Mattress, £399.99 (was £399.99) – buy here
4. Silentnight Just Dream Premium Hybrid Mattress, £480 (was £800) – buy here
5. Simba Hybrid Luxe Mattress: save £766 – buy here

Best mattress deals this September

(AD) REM-Fit Mattress: save 10% with code AUG10

rem-fit

REM-Fit 600 Lux Elite Hybrid Mattress
£854.99 (was £949.99)

What’s the deal? Get 10% off the brand’s Lux Elite Hybrid mattress by using the code: AUG10 at checkout.

Plus, you’ll get two luxury memory foam pillows, a Tencel cool mattress and pillow protectors worth up to £257 for free.

Why it’s a good buy: This UK-made mattress delivers medium-firm tension, offering the perfect balance of comfort and support.

Boasting 5,000 contouring pocket springs and an advanced dual-layer spring system, it offers deep pressure relief and adapts to your body for correct spinal alignment all night long.

Plus, the cool, breathable open-cell memory foam helps regulate temperature, while motion isolation ensures you and your partner sleep undisturbed throughout the night.

Thoughtfully designed edge-to-edge support walls also help prevent that dreaded “roll-off” feeling.

Simba Hybrid Ultra Mattress: save £766

Simba Hybrid Ultra Mattress
£2,299

What’s the deal? Save up to £766 on free items when you buy Simba’s top-tier Ultra mattress!

Why it’s a good buy: It blends responsive springs with premium foams for deep pressure relief and proper spinal alignment, while limiting motion transfer so you’re not disturbed by a restless partner.

It’s engineered to feel cooler than traditional memory foam, which helps if your bedroom runs warm.

Side sleepers get cushioned comfort; back and combination sleepers get reassuring support.

Dusk Memory Foam 4000 Pocket Sprung Hybrid Mattress: get a mystery discount with code REVEAL

Dusk Memory Foam 4000 Pocket Sprung Hybrid Mattress
£??? (was £389) with code REVEAL

What’s the deal: Get a mystery amount off the Dusk premium hybrid mattress at checkout with code REVEAL.

Why it’s a great buy: This top-tier hybrid mattress combines a massive 4000 individual pocket springs with premium memory foam layers, all wrapped in a luxuriously soft knitted casing.

The high spring count provides exceptional support where you need it most, while the memory foam gently contours to your body for pressure relief for hotel-quality sleep at home.

Simba Earth Apex Mattress: save £766

Simba Earth Apex Mattress
£1,999

What’s the deal? You can save up to £766 on free items when you purchase the Simba Earth Apex Mattress.

Why it’s a great buy: You’re getting breathable layers of British wool, silk and cashgora to help wick away moisture, plus a medium-firm feel that cushions pressure points while keeping your spine aligned.

Motion is well contained, edge support is strong, and the build quality feels made to last.

Grantham Ortho Backcare Mattress: Save 50%

Grantham Ortho Backcare Mattress
£399.99 (was £799.98)

What’s the deal? You can get a massive 50% off the Grantham Ortho Backcare Mattress at Bensons for Beds right now.

Why it’s a good buy: The 1000 springs mattress is not only a bargain, but it also features several temperature-regulating layers – a breathable, hypoallergenic layer for hot summer nights and a wool layer that helps retain heat in the cooler months.

The orthopaedic mattress features an extra-firm feel, making it ideal for individuals with back pain.

Silentnight Just Dream Premium Hybrid Mattress: Save 40%

Silentnight Just Dream Premium Hybrid Mattress
£480 (was £800)

What’s the deal? If you’re a side sleeper desperate for that perfect balance of cushiony comfort AND proper support, this Silentnight gem has a £320 discount that has your name all over it.

Why it’s a great buy: The Just Dream Premium is the real deal, combining up to 1000 individually responsive Mirapocket springs with multiple layers of premium memory foam that literally contours to your unique body shape.

The clever ReVo cooling tech actually circulates air while you sleep, and the Vitalise sleep surface harnesses your body heat to improve your circulation and metabolism as you rest.

Simba Hybrid Luxe Mattress: save £766

Simba Hybrid Luxe Mattress
£1,699

What’s the deal? Grab Simba’s premium Hybrid Luxe and save up to £766 on free items.

Why it’s a great buy: You’re getting eleven layers, including responsive micro springs and high-density foams, designed to deliver pressure relief, great spinal alignment and strong edge support.

It also limits motion transfer, so you won’t feel every toss and turn.

The feel lands around medium-firm, which suits most side and back sleepers, and the breathable construction runs cooler than classic memory foam.

How to choose a mattress

When choosing a new mattress it is important to think about how you sleep!

Start with how you sleep: Side sleepers usually need a softer feel with deeper pressure relief, while back and stomach sleepers benefit from firmer support to keep the spine aligned. Shopping for a child? Go for balanced support that adapts as they grow.

Decide on construction: A pocket-sprung mattress offers great airflow and bounce, memory foam contours closely, and hybrids pair coils with a comfy layer of foam on top for the best of both. If you sleep hot, look for breathable covers and gels rather than dense, heat‑trapping cores.

Consider your budget: You can still bag a cheap mattress that’s well‑made if you compare specs and hunt for codes. Use live chat or speak to a sleep expert to match firmness and materials to your needs, and check trial periods, delivery and returns before you buy.

While a mattress can be pricey, it’s an investment that’ll give you years of restful sleep – totally worth it!

Where to buy mattresses in the UK?

Mattress‑in‑a‑box brands make delivery and setup easy, with generous trials and quick shipping.

You can buy a Simba or Emma mattress, as well as other best-sellers, directly from the brand or via trusted retailers.

If you prefer to try in person, furniture and homeware stores are an option, but specialist sleep retailers often have the keener prices.

Big names include:

• Emma Mattresses
• Simba
• Brook + Wilde
• Nectar
• Otty
• Panda
• Happy Beds
• Dormeo
• Tempur

How to spot a good deal on a mattress

There are strong offers year‑round, with big mattress sales around bank holidays and seasonal clearances.

Brands like Emma and deals on a Simba mattress are frequent, and stores such as Dreams and Bensons for Beds run promos on select lines.

Always compare like‑for‑like specs, stack voucher codes where allowed, and check the effective price after trial, delivery and any extras.

If possible, ask about the availability of free removal or recycling of your old mattress to avoid an additional fee.

What is the best month to buy a mattress?

You can find a good discount most months, but prices often dip around bank holidays, January clearances and late spring when new ranges arrive.

Those moments tend to bring the biggest mattress sales, although solid promos also pop up between events.

Should I wait until Black Friday to buy a mattress?

If you’re uncomfortable now, don’t wait. Black Friday brings big offers, but the most popular picks — think a Simba mattress or top Emma models — can sell out fast in key sizes.

You’ll generally find a fair price any time of year, so buy when the model you want is discounted and in stock.

How much do mattresses cost?

A decent double spring option can start around £150.

Memory foam often sits higher, with good doubles from roughly £300.

Hybrids that mix coils and comfort foams typically run £400–£1,000+, and many add a plush layer of foam on top for pressure relief.

Factor in the trial (most online brands offer around 100 nights), delivery fees and any extras like old‑mattress removal.

Many online‑only brands, including Emma, ship free.

Which is the best bed-in-a-box company?

It changes as new designs land, but a handful consistently test well and deliver great service.

Emma and Simba are regular award‑winners, with broad size ranges, fast delivery and strong trials.

If you’re unsure about firmness, a quick chat with a brand advisor or sleep expert can help narrow your shortlist.

How often should you change your mattress?

The Better Sleep Council recommends replacing your mattress every seven years, but this is just a guideline.

As a general rule, aim to replace it every 6–8 years. If you’re waking sore, seeing sagging, or sleeping better on holiday, it’s time.

When you upgrade, look for retailers that include removal or recycling of your old mattress for a hassle‑free swap.