WELLNESS
08/16/2014 09:02 am ET Updated Aug 16, 2014

Our Internal Sleep Clocks Are Out Of Sync

HANK MORGAN via Getty Images

In this season of vacation travel, many of us are happily resigned to jet lag as the price of international adventure. The malaise associated with crossing time zones has been recognized for decades, of course. What's new is our understanding of the wider phenomenon that scientists call "circadian disruption," a disorder of our internal timing system. It can have profound health consequences, and its causes extend well beyond the occasional overseas jaunt.

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