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Travelling induced jet lag isn't the only thing that causes untimely fatigue. Ignoring your biological rhythms can lead to chronic exhaustion, too, something that feels so much like jet lag that Till Roenneberg and his team, at Ludwig-Maximilian University, in Munich, Germany, coined the term "social jet lag" in 2006. It occurs when there's a mismatch between your biological clock and your social life. And not only does it make you tired, it may be to blame for many of today's ailments.
In 2012, Roenneberg and colleagues studied the sleep-wake patterns of more than 65,000 people. They found that 80% of those who had jobs also used an alarm clock. The problem with that, chronobiologists say, is that our own bodies' clocks are far better for telling us when to wake up.
Unlike the rigid global clock, whose time zones are an artifice of our connected world, our internal clocks vary from person to person, and even within individuals as they move from childhood into puberty, adolescence, and adulthood. The discrepancy between our internal, biological clocks and our external, social clocks peaks around age 20. But the ongoing tug-of-war between external and internal…
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