Yes, in most cases you can sleep on a new mattress straight away, and it won’t cause any damage. The main exception is rolled or vacuum-packed mattresses, including memory foam, hybrid, and some pocket sprung models delivered in a box. These benefit from being left to fully expand for at least a few hours, and ideally up to 24 hours. Traditionally delivered mattresses, brought in flat by a delivery team, can be used immediately.
Whichever type you have, it’s worth knowing that most mattresses feel firmer when new than they will after a few weeks of use. The first night is not always the most comfortable, that usually improves as the materials begin to settle around your body.
The short answer is yes for most mattresses, but it does depend on how yours is made and how it’s been delivered.
Some you can sleep on straight away without giving it a second thought. Others just need a little time to expand and settle properly first. It’s not about safety or doing anything wrong, it’s simply about getting the mattress to feel as it should from the very beginning.
Here’s how it works depending on the type of mattress you’ve chosen.
Rolled or vacuum packed mattresses (delivered in a box)
Wait 2 to 24 hours ideally
Memory foam, hybrid, and some pocket sprung mattresses are compressed and rolled for delivery. Once unwrapped, they need a little time to expand and return to their full shape. Most reach close to their intended size within a few hours, although thicker memory foam models can take up to 24 hours to fully settle.
You can sleep on one before it has completely expanded and it will not cause any damage, but it may not feel quite right until the materials have had time to properly decompress. If possible, unpack it in the morning and let it settle through the day. If it arrives later and you need to use it straight away, that is absolutely fine.
Traditionally delivered mattresses (brought in flat)
Can be used immediately
Pocket sprung and natural fibre mattresses delivered flat do not go through a compression process, so they do not need time to expand. They can be used the same day they arrive without any issue.
The only thing worth considering is ventilation. Leaving the mattress uncovered for a few hours can help any light packaging odour disperse and allows the materials to breathe. It is not essential, but it can make the first night feel a little fresher.
Fully natural mattresses can be slept on straight away without any concerns around off-gassing. Materials like wool, cotton, cashmere, silk, and natural latex do not produce the chemical smell associated with synthetic foam.
You may notice a light natural scent from the fillings when the mattress is new, which is completely normal and fades quickly with regular use and ventilation. There is no need to wait before using it.
What is off-gassing and should you actually be concerned?
This is one of those things that sounds more worrying than it actually is, so it’s worth explaining it properly.
Off-gassing refers to the release of volatile organic compounds, often shortened to VOCs, from new foam materials. This mainly applies to polyurethane and memory foam. During manufacturing, small amounts of these compounds can remain within the material, and when the mattress is unpacked and exposed to air, they are gradually released as a light, slightly chemical smell.
The smell is real, but it isn’t harmful. The levels released by mattresses are extremely low and well below anything associated with health concerns. Some people notice it more than others, and for most, it fades quickly.
With normal ventilation, opening a window and letting the mattress air out for a few hours is usually enough. In most cases, the smell reduces significantly within 24 to 72 hours and often much sooner.
CertiPUR certification
CertiPUR certified foam has been independently tested to ensure it meets strict standards for safety and emissions. This includes being free from harmful levels of substances such as formaldehyde, heavy metals, and ozone-depleting chemicals.
If off-gassing is something you’re concerned about, it’s worth looking for this certification when choosing a mattress. A number of mattresses in the Land of Beds range carry CertiPUR certification, which is usually noted on the product page.
How long does a rolled mattress take to fully expand?
A simple reference guide for how different mattress types expand and settle over time.
Mattress type
Typical expansion time
Ready to sleep on
Fully settled
Rolled memory foam (under 20cm)
2 to 4 hours
Same evening if unpacked in the morning
4 to 6 weeks of use
Rolled memory foam (25cm+)
Up to 24 hours
24 hours after unboxing ideally
6 to 8 weeks of use
Rolled hybrid (springs and foam)
4 to 8 hours
Same evening if unpacked in the morning
4 to 6 weeks of use
Rolled pocket sprung
2 to 6 hours
Same evening if unpacked in the morning
4 to 8 weeks of use
Flat delivered pocket sprung
No expansion needed
Immediately
6 to 12 weeks of use
Flat delivered natural mattress
No expansion needed
Immediately
8 to 12 weeks of use
Don’t leave it in the packaging too long
Most manufacturers recommend unrolling your mattress within around one month of delivery. If left compressed for longer, the materials may not fully recover to their intended shape and performance. It’s always best to unpack it as soon as you can rather than leaving it stored for an extended period.
The break-in period: what to expect and how long it takes
Your new mattress is going to feel different from how it felt in the showroom, and different again from how it will feel in a few weeks’ time. That’s completely normal, expected, and temporary. The break-in period is simply the time it takes for the comfort layers to settle and adjust to your body, and it applies to every mattress type regardless of price or construction.
Most mattresses feel firmer when new than they will after four to eight weeks of regular use. Natural fillings need time to settle, memory foam needs to warm up and adapt, and springs gradually begin to respond more precisely to your weight and shape.
Because of that, the first week is rarely the best reflection of how the mattress will feel long term. It improves as the materials begin to soften and respond more naturally to your body.
Memory foam
Typically four to six weeks to fully settle. The foam gradually softens and becomes more responsive to your body heat over time. In cooler rooms, this process can take a little longer as the foam needs more time to warm up each night. Keeping your bedroom at a comfortable temperature can make a noticeable difference.
Pocket sprung
Around four to eight weeks for most pocket sprung mattresses. The springs begin to respond more precisely to your weight while the comfort fillings above them settle into place. If the mattress is double sided, regular turning from the first week helps the fillings settle more evenly.
Natural fibre
Up to twelve weeks for premium natural fibre mattresses with thicker comfort layers. These materials are denser and take longer to compress and adapt to your body than synthetic foams. Once settled, they often feel more personalised and supportive, which is one of the key benefits of natural fillings.
Hybrid
Typically four to six weeks. The foam or latex comfort layers adjust to your body shape while the pocket springs begin to respond to your weight distribution. Hybrids tend to settle slightly faster than fully natural mattresses because the foam layers react more quickly to heat and pressure.
What to do on the first night: a practical checklist
First night checklist
1
Unbox or unroll the mattress as early in the day as possible. The more time a rolled mattress has to expand before you sleep on it, the better. Remove all packaging completely.
2
Place it on your bed frame and check the slats. Slats should be no more than 7 to 8cm apart and in good condition. A solid, even base makes a noticeable difference to how the mattress feels.
3
Leave it uncovered for a few hours. For rolled foam mattresses especially, letting it breathe without sheets and opening a window helps disperse any packaging smell and allows the materials to settle properly.
4
Fit a mattress protector before adding sheets. A breathable protector helps keep the mattress in good condition from day one without affecting how it feels.
5
Make the bed and sleep on it. That’s what it’s there for. It won’t feel like its final version just yet, but it will begin to adjust from the very first night.
6
Start rotating from week one. Rotate head to toe every couple of weeks for the first few months to help the mattress settle evenly and maintain its shape.
How to break in a new mattress properly
The break-in process isn’t passive. There are a few simple things that help it happen more quickly and more evenly.
Sleep on it every night
Consistent use is the most important factor. Every night on the mattress helps the fillings compress and begin forming the personalised support that defines how it will feel long term. Sleeping elsewhere, even occasionally, slows the process. For the first few weeks especially, it’s worth using your new mattress every night.
Rotate regularly
For the first three months, rotate the mattress from head to toe every two weeks. After that, once a month is usually enough. This helps distribute compression evenly and prevents body impressions forming in one area. If the mattress is double sided, it should be turned as well as rotated. Always follow the care guidance provided with the mattress.
Keep the room warm enough
For memory foam in particular, room temperature plays a role in how quickly it softens and settles. A colder room slows the process. Keeping your bedroom at a comfortable 18 to 20°C helps the foam respond more effectively to your body heat. This matters less for natural fibre and spring mattresses.
Don’t judge it too early
It’s best not to make any decisions about whether the mattress is right for you before the six week mark. Most mattresses feel noticeably different by weeks four or five compared to week one, usually softer and more responsive. If it still doesn’t feel right after eight weeks, that’s the point to consider whether a topper or a different tension would be a better fit.
Frequently asked questions
Can you sleep on a rolled mattress before it is fully expanded?
Yes, it is safe to sleep on a rolled mattress before it has fully expanded and it will not cause any damage. The reason to wait, where possible, is comfort. A mattress that has not fully decompressed will not feel or support as well as it will once it has regained its full shape. If you can, unbox it earlier in the day and let it settle before sleeping on it.
How long does off-gassing last?
Any noticeable smell from a new foam mattress usually fades within 24 to 72 hours with normal ventilation. A very faint scent can linger a little longer but becomes less noticeable over time. Opening a window and letting the mattress air out during the day helps speed up the process. Natural mattresses do not off-gas in the same way.
Should you use a mattress protector straight away?
Yes, ideally from the first night. A breathable mattress protector helps protect against moisture, spills, and everyday wear without affecting comfort. If you want to let a rolled mattress air out first, leave it uncovered for a few hours, then fit the protector before making the bed.
Why does a new mattress feel firmer than the one in the showroom?
Showroom mattresses have already been broken in through regular use, so the fillings have settled and the materials have adapted. A new mattress has not gone through that process yet. Temperature can also play a role, as showroom mattresses are kept in a stable environment. With regular use, most mattresses feel noticeably different within four to eight weeks.
How do you know when a mattress has fully broken in?
The clearest sign is that it starts to feel natural and comfortable rather than noticeably firm or unfamiliar. For most people, this happens between four and eight weeks. Natural fibre mattresses can take a little longer. If it still feels consistently uncomfortable after that point, it is worth reviewing whether the tension is right for you.
Shop mattresses and mattress care at Land of Beds
We stock mattresses across all constructions including pocket sprung, memory foam, hybrid, latex, and natural, in every UK size and tension. You will also find mattress protectors, toppers, and everything you need to get set up properly from day one. Free UK delivery is available on orders over £100, with 0% finance options.
Call 01928 242829 or visit our showrooms in Greater Manchester and Cheshire. Our team are always happy to advise on first night care, rotation, and getting the best from your new mattress.
Browse all mattresses
Every type, tension, and size, including pocket sprung, memory foam, hybrid, and natural options.
Alice brings a background in marketing, design, and branding to Land of Beds, where she focuses on making sleep advice simple, relatable, and practical for everyday life. She holds a degree in Graphic Design with a specialism in branding and design, giving her a strong understanding of how interior spaces, colour, layout, and environment can influence comfort, mood, and overall wellbeing.
Her creative background allows her to provide both expert bed and mattress guidance and bedroom design inspiration that helps customers create spaces that feel as good as they look.
Alongside her work in marketing and branding, Alice has collaborated with internationally recognised brands including Campari and Aperol, Paulaner, and Malfy, helping develop her expertise in consumer-focused communication and lifestyle content. She has also been trained by and works closely with leading UK bed and mattress manufacturers including Harrison Spinks, Hypnos, and Vispring, building extensive knowledge of mattress technology, sleep ergonomics, bedroom comfort, and sleep wellness.
Passionate about the life-changing impact of quality sleep, Alice creates content designed to help readers make informed decisions to improve their sleep environment, wellbeing, and everyday routine.
