Keep the bedroom cool at night, often around 18.5–19°C (about 67°F), while using blankets or layers so your body stays comfortable. The goal is to help core and brain temperature drop enough to fall asleep and stay asleep, which can improve sleep onset, deep sleep, and sleep maintenance.
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“Similarly, you should try and make your sleeping environment pretty cool, if not cold. Now that doesn't mean you need to be cold while you're asleep.”
huberman · Essentials: Sleep Toolkit for Optimizing Sleep & Sleep-Wake Timing · Jun 11, 2026 · 23:04 · open ↗