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Sleep

Core Body Temperature and Sleep

Core body temperature must fall to initiate sleep—supported by cool rooms, timed baths, and avoiding late hard training or alcohol.

Core body temperature and sleep are linked: a drop in core temp helps initiate sleep, while a warm bedroom, late intense exercise, or alcohol can blunt that drop and fragment nights. Cooler rooms, warm baths one to two hours before bed, and finishing hard training earlier support the evening dip.

Fever and illness invert the pattern.

Common questions

  • Does a hot bath help sleep temperature?

    A warm bath one to two hours before bed can trigger a rebound core drop that aids sleep onset. Ice baths right before bed are individual—experiment if training is early.

Related guide

Jet Lag Nutrition Basics: Meal Timing That Helps Your Body Clock Shift →

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