Most people sleep best in a cool room—roughly 16–19°C (60–67°F). Cooling helps the body’s natural temperature drop at night, which supports faster sleep onset and deeper sleep.
Why This Matters
This matters because thermoregulation is part of the sleep switch: a small drop in core temperature leads to sleepiness. Overheating results in more awakenings and lighter sleep, especially during REM. Adjusting temperature, bedding, and airflow often leads to quick, noticeable improvements.
Where This Changes
Preferences vary with age, body composition, and hormones, and illness can change comfort needs. If you can’t change room temperature, you can often change microclimate with breathable bedding, fans, or cooling/warming mattress toppers.
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