At 70 years old, grinding toward my audacious goal of living to 200 with The 200 Year Life Project, sleep is non-negotiable—it's the ultimate recovery tool for cellular repair, hormone balance, and cognitive sharpness. Even though I already take a refreshing shower every morning to kickstart the day, I make it a point to take a hot shower every single night about 1-2 hours before bed. It's one of my simplest yet most effective biohacks for falling asleep faster and waking up more restored.

The Science: How Heat Triggers Your Body's Natural Sleep Signal

Your core body temperature naturally drops by about 0.5-1°F in the evening as part of the circadian rhythm—that's the signal telling your brain it's time to wind down. A hot shower (or bath) accelerates this process in a clever way: The warm water dilates blood vessels, pushing heat to your skin, hands, and feet. When you step out, that heat dissipates quickly through evaporation and radiation, causing a rapid drop in core temperature—mimicking (and enhancing) the body's pre-sleep cooldown.