The day before a long flight you are frantically doing last-minute chores 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 flow, you spent the entire day sightseeing and taking pictures. By evening, exhaustion has set in, and the next morning, you can hardly wake up before noon. Jet lag has taken hold.