Jet-lagged and forgetful? It's no coincidence: Memory, learning problems persist long after periods of jet lag

Holiday travel can leave people cranky and tired, in part because of jet lag, the result of your body's internal clock being out of synch with your current time zone. For chronic travelers, it's more than a passing annoyance, however. A new study shows that chronic jet lag can cause long-term brain changes that lead to memory and learning problems for at least a month after return to a normal schedule.

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