" ..fly in the afternoon if you're headed west and in the morning if you're going east..If you have to take a night flight, he suggests at least trying to get in a nap the day before. "Taking a nap before you're exhausted can actually reduce the adverse effect of being awake at the wrong time of day. This is what we refer to as prophylactic napping. "

― Arianna Huffington , The Sleep Revolution: Transforming Your Life, One Night at a Time