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Best bedroom temperature for deep sleep

The best bedroom temperature for deep sleep is roughly 16–19°C — around 18°C suits most people. A cool room helps your core temperature drop, which is part of how the body moves into deep sleep; a room that is too warm keeps your temperature up and fragments sleep. Aim for the cool side of comfortable and adjust to what works for you.

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A temperature scale from 12 to 26 degrees Celsius with the 16 to 19 degree band highlighted green as ideal, colder shown as too cold and warmer shown as too warm where deep sleep suffers, and about 18 degrees marked as the target.
A cool room, roughly 16–19°C, lets your body drop into deep sleep. Too warm fragments it.

Why cool wins

Deep sleep rides a falling body temperature.

Aim for roughly 16–19°C. A cool room helps your core temperature drop, which is part of how the body moves into deep sleep (Harding et al., 2019). Around 18°C suits most people.
Too warm is the common problem. A hot room keeps your core temperature up and fragments sleep — the most frequent temperature mistake, especially in summer.
Adjust to you. The ideal varies by person and bedding; if you wake hot or clammy, cool the room, lighten the covers, or improve airflow.

You do not need a perfect number — you need to be on the cool side of comfortable, so your body can do what it does naturally on the way into deep sleep.

One habit among several

A cool room is one swap. Train the rest.

Temperature is one of several habits that decide your deep sleep, alongside caffeine timing, alcohol, light and schedule. SLEEPCOACHGAME shows you 12 real-life scenes in 58 seconds, you answer Green Light or Red Light, and your AI Coach names the thief your round caught and the swap that gives your deep sleep — the cool room included.

Deep sleep turns waking up into something you look forward to.

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