"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 time can affect everyone from school-aged children—whose schedules are dictated by their school districts—to those of retirement age and beyond. People stay up late, or sometimes not; use alarms to wake up early, or snooze it to sleep in; and then spend weekend mornings trying to make up for the sleep they missed, or they don’t. The result? A massive sleep debt and an off-kilter internal clock."
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