1This lecture concerns circadian misalignment, the chronic disruption that occurs when our internal body clock conflicts with external schedules.
2Although society treats shift work as a mere inconvenience, epidemiological evidence now links it to serious metabolic and cardiovascular disease.
3The master clock in the brain synchronises peripheral clocks in organs such as the liver, pancreas, and gut.
4Night work forces eating and activity into biological windows when the body is primed for fasting and repair.
5Contrary to popular belief, workers do not simply adapt: even veteran night shift nurses show persistent hormonal disruption.
6The initial studies implicated sleep loss alone, though further analysis revealed meal timing as an independent and powerful culprit.
7Glucose tolerance deteriorates markedly at night, meaning an identical meal produces a far larger blood sugar excursion after midnight.
8What I want to emphasize here is that light exposure, not merely wakefulness, drives much of this metabolic derangement.
9Interventions therefore combine carefully timed light exposure, scheduled meals, and strategic caffeine, rather than relying on sleeping pills alone.
10It was not total sleep duration but the regularity of sleep timing that best predicted long term health outcomes.
11Some researchers advocate chronotype matched rosters, assigning morning types to early shifts, though implementation across industries remains rare.
12To conclude, circadian misalignment is a preventable occupational hazard, and treating it as such is frankly long overdue.