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Not Changing Your Watch to Local Time
You may just be passing through Chicago on a layover, but you still need to reset your watch, even if you're in the Central Time zone for only an hour. Turner says, "We hear a lot of stories about people missing their flights because they don't remember what time zone they're in." Taking the red-eye from Seattle to New York with a layover at O'Hare is exhausting enough; miss your connecting flight because your watch is still on Pacific Time, and now you've added frustration to your fatigue.