🌅 Circadian Rhythm Simulator
Visualize your 24-hour body clock — melatonin, cortisol, and the SCN master clock
What Is a Circadian Rhythm?
Your body runs on a 24-hour internal clock driven by the suprachiasmatic nucleus (SCN) in the brain. This master clock synchronizes every cell's timing with light-dark cycles, controlling when melatonin rises (signaling sleep), when cortisol surges (waking you up), and how body temperature fluctuates throughout the day.
Why does this matter? Disrupted circadian rhythms are linked to obesity, diabetes, depression, cancer, and cardiovascular disease. Understanding your body clock lets you optimize sleep, alertness, and overall health by aligning behavior with biology.
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Light Therapy
Morning light resets the SCN master clock
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Sleep Architecture
REM and deep sleep follow circadian gates
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Exercise Timing
Peak performance aligns with core temp peak
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Chrononutrition
Meal timing shapes metabolic health
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Jet Lag Recovery
1 day per time zone to re-entrain
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Chronotherapy
Drug timing for maximum efficacy
Quick Start
Basic Controls
Event Log
Circadian simulator ready. Press Start to begin the 24-hour cycle...
Melatonin: 0.0 pg/mL
Cortisol: 0.0 ug/dL
Core Temp: 36.5 C
Sleep Quality: -- %
Circadian Phase: 0:00
Alertness: -- %