The Physics of Sleep: Why You Must Cool Down to Fall Asleep

The transition into sleep is as much a thermal process as it is a chemical one. For your brain to initiate the sleep cycle, your core body temperature must drop by approximately two to three degrees Fahrenheit.

The Warm Bath Paradox Explained

Many people find that a hot bath before bed helps them sleep. This works because it triggers a biological response called vasodilation. Hot water draws blood to the surface of your skin, which allows heat to escape from your core rapidly as soon as you step out of the bath. This rapid cooling signal tells the brain that it is time for sleep.

Thermal Environment Optimization