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Biohacking glossary

What is Circadian rhythm?

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Quick answer

Circadian rhythm: definition

The circadian rhythm is your body's roughly 24-hour internal clock that regulates sleep, alertness, hormone release, body temperature and metabolism.

Circadian rhythm, explained

A master clock in the brain's suprachiasmatic nucleus is set primarily by light entering the eyes. Peripheral clocks in organs are influenced by meal timing, activity and temperature.

Morning light advances and stabilizes the rhythm; bright evening light delays it.

Why it matters

Circadian alignment supports sleep quality, energy, mood and metabolic health. Consistent wake times and morning daylight are the best anchors.

Learn more

Biohacking · GuideSleep Optimization: How to Get Deeper, More Restorative SleepHow to optimize sleep: duration, timing, light, temperature, caffeine and alcohol, sleep stages, wearables and when to see a doctor. Evidence-informed and practical.Performance · GuideEnergy Optimization: How to Build Steady, All-Day EnergyWhy you feel tired and how to fix it: circadian rhythm, sleep, blood sugar, hydration, caffeine timing, movement and when fatigue is a signal to see a clinician.

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FAQ

Circadian rhythm FAQs

What is Circadian rhythm?

The circadian rhythm is your body's roughly 24-hour internal clock that regulates sleep, alertness, hormone release, body temperature and metabolism.

Why does Circadian rhythm matter?

Circadian alignment supports sleep quality, energy, mood and metabolic health. Consistent wake times and morning daylight are the best anchors.

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