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Mattress buying guide: How to choose a mattress for the best night’s sleep

From open spring to bed-in-a-box, we explain the ins and outs of mattresses

How firm your mattress is will affect how well you sleep – the type of firmness you need will depend on your sleeping position, height and weight ( The Independent/Casper )

Getting a good night’s sleep is essential to staying happy and healthy. But buying a mattress without doing your research first can lead to sleepless nights and achey mornings, if you aren’t sleeping on a supportive base.

And mattresses can cost anything from a few hundred pounds to thousands, so you’ll want to make sure your chosen mattress is worth the investment before you buy. For more guidance, see our best mattress roundup of tried and tested products.

Here, we’ve put together everything you need to know before you hit the high street (or browse the web – online-only mattress companies are on the rise).

So whether you’re a side sleeper or suffer from chronic back pain, read on to find out what option is best for you. 

Types of mattress

Open spring mattress: Also known as open coil or continuous coil mattresses. These contain one long piece of metal wire coiled into numerous springs. There’s also an additional border rod or wire to maintain shape and provide structure. It’s a great value for money option, although sides are machine-stitched rather than hand-stitched, but they are lighter than other models, making them easy to turn. They tend to be less supportive than other mattresses too, so are most suited to guest bedrooms or as children’s beds, where they are used occasionally or will need to be replaced regularly anyway.

Pocket spring mattress: This type of mattress is more luxurious, as it’s made from individual, small springs housed in their own pocket of fabric. This means each spring moves independently, providing more support than open spring mattresses. You can buy soft, medium or firm versions, depending on your preference, and they are more breathable than memory foam or latex mattresses (so ideal if you’re always getting too hot during the night). These are heavy to turn though, and can be filled with natural materials such as lambswool which may agitate allergies. This is a good option if you’re looking for a bed for two people, as the separate springs will cater for your different needs and weights, while they will also minimise the risk of you rolling towards your partner in the middle of the night. 

Memory foam mattresses are hypo-allergenic and will mould to the shape of you (Eve Sleep)

Bed-in-a-box: The game-changer of the sleep world, these mattresses have revolutionised the way we buy our beds. Casper, one of the first bed-in-a-box companies, launched in the UK in 2016 and its popularity has seen other brands such as Simba and Leesa follow suit. The name refers to the delivery method; removing the painful task of visiting mattress shops and waiting weeks for delivery, these mattresses are ordered online and arrive within days. Usually compressed and rolled into a box, there’s no need to “pivot!” like Ross and Rachel from Friends with one of these. Unravel the mattress and it will be ready to use within a few hours. They are usually made from foam or a hybrid between memory foam and springs.

Memory foam mattress: These more modern mattresses are made from memory foam, which is a mouldable material that also responds to temperature and weight, and has hypo-allergenic properties. This means it will mould to the shape of your body, absorb your weight and relieve pressure on your joints. Not everyone likes the sinking motion of this type of mattress, and it can get rather warm, but it’s ideal for those who need support or suffer from a bad back, as it will maintain posture and align your spine horizontally when sleeping on your side.

Latex mattress: As the name suggests, these mattresses are filled with latex foam, which is an especially breathable material, so you won’t overheat in the middle of the night. It’s also extremely durable and should last for many years. And it’s a good option for those with allergies or asthma. They can feel rather solid at first though, so they’re better suited to those who prefer a firmer bed. Usually heavy, latex mattresses can be difficult to turn and cheaper versions can develop lumps and dents over time. 

Hybrid: Drawing from a combination of materials that usually include memory foam, latex and pocket springs, hybrid mattresses are designed to give a more balanced sleeping experience. They often come with a pocket-sprung base and a memory foam top layer, providing both comfort and support – alleviating aches and pains by responding to your body’s shape.

Continuous and coil: A popular budget option, a continuous coil mattress is made from a single looped wire, while an open coil mattress is made from single springs fixed together with one wire. These are significantly cheaper than other mattress types, but be warned that with the attractive price tag comes the likelihood of these mattresses wearing out and sagging quickly. These mattresses also move around a lot with you as you sleep – as they are designed as one unit – so if you or your partner tosses and turns in the night, we’d suggest you consider other options. 

Mattress sizes 

These are the UK standard sizes for mattresses:

Small single: 75cm x 190cm
Single: 90cm x 190cm
Small double: 120cm x 190cm
Double: 135cm x 190cm
King size: 150cm x 200cm
Super-king size: 180cm x 200cm
Emperor: 200cm x 202cm
Large emperor: 215cm x 217cm

Once your mattress is delivered, make sure you let it air for at least four hours. This will remove any storage smells of damp or cold (iStock)

Mattress firmness 

How firm your mattress is will affect how well you sleep. The type of firmness you need will depend on your sleeping position, height and weight. Here we explain what level of firmness is best for what type of sleeper.

Soft: Side sleepers or those who change positions during the night are best suited to soft mattresses. This is because the way you sleep already relieves pressure from your spine so you want your mattress to mould to your body’s natural position. 

Medium soft: This is ideal for those who change their sleeping position during the night, as it will still mould to your body position but provide a little more support.

Medium firm: This is best for people who sleep on their back as you require extra lower-back support, which this type of firmness offers. 

Firm: This type of mattress is ideal for those who sleep on their front, are over 15 stone or suffer from back pain. This is because it will keep your back in a relatively comfortable and stable position without allowing you to sink into it as you sleep, which can cause lower-back pain. 

How should you sleep while pregnant?

During your first trimester, you’ll often feel sleepy and want to nap. It’s important you get the rest you need so sleep in whatever position feels most comfortable, including on your front or back. 

In your second trimester, you’ll feel the baby’s weight more, which can feel uncomfortable and put extra pressure on certain areas of your body. This is when a soft mattress will help, while your bigger bump means the recommended position to sleep in is on your left side, as sleeping on your back will cause your bump to press against a main blood vessel, which may cause you to feel faint.

During your third trimester, your lower back may be a source of pain as it supports your baby’s increasing weight. To ease this, continue to sleep on your left side and with a pillow under your head, between your knees and under and around your bump to ease discomfort and take pressure off your muscles and hips. We’ve also reviewed pregnancy pillows to help mums-to-be sleep.

What mattress do you need if you suffer from joint or back pain?

A good mattress needs to give both support and comfort and that includes ones for those who suffer from back problems. 

Although a firm mattress is recommended by some retailers, you should always look for a mattress that keeps your back aligned while sleeping and relieves pressure points along your spine and joints. This has a lot to do with your weight (the heavier you are, the firmer your mattress should be), so it’s best to try a mattress before you buy – many online retailers now offer a trial period where you can return the mattress and get your money back if you don’t think it’s right for you. 

The pillow you use will also affect your sleeping position and back alignment so make sure you pick one that suits your needs. Take a look at our pillow reviews to find out more.

Mattress care

Once your mattress is delivered, make sure you let it air for at least four hours. This will remove any storage smells of damp or cold. Ideally, the mattress should then be aired weekly by removing the bed linen. Remember to turn your mattress regularly too. This will stop dips forming and your weight altering part of the mattress, causing uneven sleeping. 

Hybrid mattresses can provide a more tailored sleeping experience with some offering customisable inserts (Tweak)

Having a mattress protector will also help keep your mattress clean, prolonging its life. This is a sheet that goes on before your bed linen (and mattress topper) to protect your mattress from any stains or dirt.

You should aim to replace your mattresses every eight to 10 years though. This is not only for hygiene reasons but because it will soften over time, reducing the support it gives you. If you feel sore when you wake up or you find you sleep better in other beds, it’s time for a change.

Mattress toppers 

A mattress topper is an extra layer of cushioning that goes over your mattress before you put your bed sheets on. They provide additional support and comfort, while also making your bed feel more luxurious and cosy. You can pick from a variety of materials: goose feathers, polyester, cotton and wool to name a few. If you’re looking for one to complete your bed, take a look at our mattress topper reviews. 

IndyBest’s Best Buy mattress

Emma Original Mattress: £649 for a double, Emma

Despite the name, this is the second version of this popular German-made three-layer foam mattress, which uses a different kind of foam to the likes of Eve, Simba, Casper and Leesa that the manufacturer claims is longer-lasting. Also exclusive to Emma is the exceptionally breathable top layer. We found it more instantly comfortable than other bed-in-a-box mattresses we tried, it has significantly more bounce and is easier to turn over on – with no chance of disturbing your partner when you do.

There isn’t a body shape or type of sleeper that it wouldn’t suit, making it a great all-rounder, and it doesn’t need turning, although there are handles if you need to move it. There’s also a washable cover. The icing on the cake is that there’s no minimum time-frame to request a return, and if you do decide to send it back (we doubt you will), you don’t have to repackage it. This is as good as it gets.

Buy now

Find out more about mattresses

IndyBest product reviews are unbiased, independent advice you can trust. On some occasions, we earn revenue if you click the links and buy the products, but we never allow this to bias our coverage. The reviews are compiled through a mix of expert opinion and real-world testing.

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