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Bedroom temperature for sleep
Body temperature has to drop a little for you to fall asleep, so a slightly cool bedroom helps — roughly 16–19 °C for most adults.
Why cool helps
Falling asleep depends on your core temperature dropping by about half a degree. A bedroom that is too warm fights that process, which is why a hot summer night leaves you tossing. A cool, dark, quiet room is the single most reliable environmental change for better sleep.
Getting there without a thermostat war
If you cannot set the room precisely, work with what changes temperature: air the room before bed, use lighter bedding in summer and layers in winter, keep feet warm (warm feet actually help the body shed heat), and block low evening sun. A warm shower an hour before bed helps too — the after-drop in skin temperature nudges you toward sleep.
| Who | Comfortable range |
|---|---|
| Adults | 16–19 °C (60–67 °F) |
| Babies and toddlers | 16–20 °C (61–68 °F) |
| Too warm to sleep well | above ~24 °C (75 °F) |
More on a healthier home
Tap water and water hardness
In most of Europe tap water is safe and well tested. "Hard" or "soft" is about minerals, not safety.
Indoor humidity and mould
Aim for 30–50% relative humidity. Above 60% invites mould and dust mites; below 30% dries you out.
Radon in the home
An invisible ground gas that builds up indoors in some areas. The only way to know your level is to test.
Ventilation and indoor air (CO₂)
Stuffy air is mostly a ventilation problem. Rising CO₂ tracks it and dents concentration.
Source: General building-health guidance (WHO indoor-air and radon references and national health and water authorities). · checked 2026-09-04
Frequently asked questions
Is it bad to sleep in a cold room?
A cool room is good; a genuinely cold one is not. If you are shivering or your hands and feet stay cold, warm up the bed or add a layer. For babies the room should not be cold — aim for the range above and use safe sleepwear rather than loose blankets.
Why do I sleep badly in summer?
Warm nights keep your core temperature up, which delays and fragments sleep. Air the room in the evening, use a fan, lighter bedding, and keep the day's sun out with blinds.
See what actually improves your sleep
TempoLife tracks sleep, hydration and more, so a change at home becomes a visible trend.