Jet Lag

Rick Steves has some good advice, including the basics:

Leave home well-rested

On the flight, drink plenty of liquids, eat lightly, and rest

Reset your mind to local time (and your watch!)

On arrival, stay awake until an early local bedtime

It will be difficult, but try to sleep on the plane rather than sitting up talking and watching the films. Consider bringing eyeshades and earplugs to help you sleep.