Circadian rhythms are internal clocks that coordinate sleep, metabolism, hormone release, and behaviour. This module helps you understand how these rhythms work and how light, routine, and environment shape them.

You begin by exploring the suprachiasmatic nucleus (SCN), the brain’s master clock. It synchronises peripheral clocks in organs and tissues, keeping the body aligned with the 24‑hour day. Light is the primary cue: morning light resets the clock, while evening light delays it.

You then explore how circadian rhythms influence energy levels, digestion, cognitive performance, and mood. You learn why irregular schedules, shift work, and screen exposure can disrupt these rhythms and how small adjustments can restore alignment.

The module also highlights how circadian biology informs medicine, from optimising drug timing to understanding metabolic disorders.

By the end, circadian rhythms feel like a quiet architecture that guides daily patterns and supports long‑term health.

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