Circadian Rhythm, DST, and Biological Timing
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Circadian Rhythm, DST, and Biological Timing
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This episode provides an extensive overview of Daylight Saving Time (DST), focusing heavily on its physiological effects and historical development. It explains that the body's internal clock, or circadian rhythm, is regulated by light, meaning the sudden one-hour shift causes a temporary misalignment that impacts everything from balance and coordination to the timing of hormone production and cardiovascular function; the body requires several days to adjust fully. Historically, the adoption of standardized time zones was driven by the railroads for safety and efficiency, making the later implementation of DST possible, primarily to conserve fuel during wartime. Finally, it explores the modern policy debate, noting that medical science often supports permanent Standard Time for health, while economic and leisure interests favor permanent DST for later evening daylight.