Circadian Rhythm Calculator
Your body isn't a machine; it's a biological clock. Align your habits with your rhythm.
How Your Internal Clock Works
The circadian rhythm is a 24-hour internal clock that cycles between sleepiness and alertness. It's regulated by the **Suprachiasmatic Nucleus (SCN)** in your brain, which responds to light and dark signals.
Cortisol Spike
Occurs shortly after waking to provide energy and alertness.
Melatonin Rise
Usually begins 2-3 hours before your ideal bedtime as light dims.
Body Temp
Your temperature drops to its lowest point about 2 hours before waking.