Anyone who has flown across a few time-zones knows just how inconvenient jet lag can be be. You either arrive in a new destination exhausted, often unable to sleep, or find yourself walking around a new location in the middle the day like a zombie. A Jet Lagged Sea Otter Fundamentally jet lag occurs because your body's internal clock is out of sync with the time in the new location after you arrive. While you can observe jet lag whenever you cross a time zone or two, it's usually more prevalent when flying between continents. The worse jet lag I ever had was coming back to Canada from Ireland ...