The day before a long flight you are frantically doing last-minute chores and errands, packing and reading guide books.Then,on the plane, you have several drinks with dinner and stay up late watching the movie. After a brief nap, it's time for breakfast and a morning arrival in, let's say, Paris or Rome. Adrenaline flowing, you spend the next morning you can hardly wake up before noon. Jet lag has taken hold.