Many people turn the heating down and still sleep in a sweat. The reason: room temperature is only half the equation.
Two different temperatures
What a thermometer on the wall measures is not what your skin feels. Under the duvet, between pillow and cheek, a small climate of its own builds up. It can be ten degrees warmer there than in the room — and that is where it is decided whether you sleep through.
As you fall asleep, the body lowers its core temperature by one to two degrees and releases that heat through the skin. If it cannot escape because the material traps it, the body reports overheating — and wakes up. Often without you remembering it in the morning.
What room temperature does give you
It remains the basis. As a guide value, around 15.5 to 19.5 degrees applies. Evaluations across millions of nights show that sleep efficiency drops measurably with every degree warmer and falls off clearly above about 24 degrees.
But if you lie at 18 degrees under an airtight duvet on a pillow that stores heat, you get little out of it.
The problem with classic memory foam
Memory foam adapts because it reacts to warmth — that is exactly what makes it comfortable. But the same property is also its drawback: it takes up body heat and releases it poorly. Anyone who has slept on a cheap foam pillow knows that warm, slightly sticky feeling after an hour or two.
How we solved this in the SleepFit
We work with three layers, and each has a job.
The outer cover lies directly against the skin and passes moisture on. Underneath lies a climate layer that lets air circulate instead of shutting it in. The core consists of gel-enriched memory foam — the gel evens out temperature peaks instead of storing them.
No magic, just a choice of materials. That is also why we do not say that the SleepFit cools you — it simply traps less heat than a plain block of foam.
Three things you can test this evening
- Air the room shortly before going to bed. Five minutes of draught achieve more than a night with the window on the latch.
- Pay attention to your feet. Warm feet help the body release heat through the skin — socks can, paradoxically, help you cool down.
- Turn the pillow over. If the other side is noticeably cooler, your current pillow is trapping heat.
The last point is the most honest test there is — and it costs nothing.
Sources
- National Sleep Foundation on the optimal bedroom temperature, summarised at the Sleep Foundation
- Evaluation of more than 3.75 million nights, SLEEP, 2020. Read the abstract
