Circadian Rhythm

Light, temperature, and timing cues that sync your internal clock for easier sleep.

5 articles

Circadian Rhythms: Your Body's 24-Hour Clock

Your internal 24-hour clock governs sleep, hormones, metabolism, and mood -- here's how to align it in modern life.

Melatonin isn't a sedative—it’s a time signal. How it works, who it helps, and what the latest science says.

How to use melatonin—best timing windows, dose ranges, and jet-lag strategies.

Caffeine’s half-life, timing rules of thumb, and how to set a personal cutoff so you sleep on time—without giving up coffee.

Sleep isn't downtime--it's an active nightly reset. Here's what modern science actually says and how to use it.