介绍:
Traveling abroad can be exhilarating. But sometimes it's easy to discount the crippling jet lag that can set in after traversing multiple time zones -- leaving you exhausted, disoriented and possibly causing you to miss out on your vacation. Jet lag occurs when the brain cells that regulate our circadian rhythms -- which serve as our bodies' internal clock telling us when to wake up, eat or sleep -- are out of sync with the time zone we are in.
