The first night on a new mattress often feels transcendent. By month thirteen, something has shifted, and the mattress somehow feels less supportive than it did at the start. You haven't imagined it. The materials have changed, measurably, and the changes are largely invisible from the outside.
New mattresses are denser than they'll ever be again. The foams are compressed from shipping, the springs are at their factory tension, and the cover hasn't yet been worked loose by repeated flexing. For the first four to eight weeks, the mattress is actively softening as the comfort layers settle into their working density. This is normal. Manufacturers build for it.
What most people experience as "breaking in" the mattress is partly the mattress adjusting to you, and partly you adjusting to the mattress. After about six weeks, the material settles into a new equilibrium that will become the mattress's real personality. That's the baseline. Everything from there is either drift or decline.
Memory foam and polyfoam both soften over time through a process called compression set. Repeatedly loading and unloading the same area causes the polymer structure to lose some of its capacity to fully rebound. Cheaper foams show this within months. Higher-density foams, typically above 50 kg/m³, resist it far better but aren't immune.
This isn't a defect. It's chemistry. You can feel it first as a slight loss of "push-back" from the surface, then eventually as visible body impressions. By the twelve-month mark on a mid-grade memory foam mattress, the comfort layer is often 5–15% less resilient than it was when new.
Mattresses age unevenly. Most people sleep in roughly the same position on the same side of the bed every night, which means the shoulder and hip regions of the sleeping area take thousands of repeated loading cycles while the centre and foot-end take relatively few. Over twelve months, that creates a density differential across the surface. The areas that carry your weight lose resilience fastest. The areas that don't, stay closer to new.
This is why rotating a mattress every two to three months makes such a noticeable difference. It distributes the loading more evenly across the surface so no single zone is aged at a dramatically different rate from the others. People who never rotate tend to report the "my side feels broken in" sensation by the end of year one.
Yes, and the degree matters. Some change is expected and healthy. The mattress should feel slightly softer than it did new, slightly more contoured to your body, slightly more familiar. What isn't healthy is a noticeable loss of support, permanent indentations, or a sensation that the mattress is no longer holding you at the right height.
The useful test is whether you're waking up feeling restored. If the mattress has simply settled and you still sleep well, nothing is wrong. If you've started waking stiff, rolling toward a dip, or sleeping worse than you did six months ago, something in the structure has shifted beyond normal break-in.
A detail most people don't consider: your mattress absorbs a surprising amount of moisture. The average adult loses somewhere between 300 ml and a litre of water through sweat and respiration during a night's sleep, and a fraction of that ends up in the comfort layers. Over twelve months, that's a significant cumulative load. Moisture affects foam's resilience and provides conditions for dust mites to flourish.
Environmental temperature matters too. Memory foam in particular is temperature-sensitive; it softens in warmer rooms and firms up in cooler ones. A mattress that spent its first summer in a warm bedroom may have been under more load, in a softer state, than it was designed for. Cooling hybrid constructions address this partly by combining breathable foam with pocket springs that allow airflow, though no material is fully immune to thermal effects over time.
Pocket springs don't suffer compression set the way foams do, but they're not immune to change. Individual coils can lose a small fraction of their tension over time, particularly if the mattress is used without adequate base support. The felt pads or foam layers that sit on top of the spring unit compress, which changes how directly you feel the springs through the comfort layer.
The most common spring-related issue in year one is edge collapse. The perimeter, which often uses either a firmer edge spring or a foam encasement, tends to soften faster than the interior because it's compressed every time you sit on the edge. This is why you might notice the edges feel "less there" after a year even when the sleeping surface itself still feels reasonable.
Rotation is the single highest-return intervention. Mark your calendar quarterly. Flipping a double-sided mattress doubles the available wear life, though few modern mattresses are flippable.
A proper bed base prevents most of the premature wear that shows up in year one. Slats spaced too widely, or a damaged divan base, will cause mattresses to sag prematurely. Pairing a new mattress with functional and elegant bed designs that offer proper slat spacing protects the investment from the underside up. Airing the mattress every few weeks, pulling the cover back and letting it breathe for a few hours, helps with moisture.
None of this reverses existing wear. It extends the life of what's still good.
Not necessarily. Even premium mattresses feel different at twelve months than they did new. The question is the degree and direction of the change. A good mattress settles into a slightly softer, more familiar version of itself. A poor one genuinely degrades; it develops impressions, loses support, and starts undermining the sleep it used to protect.
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