Long-haul flights are stressful. To avoid stress and jet lag,
consider these:

• Start conditioning your body for a long flight by avoiding alcohol.
• Set your body clock to the time zone of your destination by sleeping and getting up earlier than the usual each day.
• Wear two watches: one watch should be set to the current time zone, and the other to the time at your destination.
• Dress up in comfortable clothes during the trip. Don't wear closed clothes--prolonged sitting can make your feet swell.

http://www.asia.com/travel-guide/videos/video-tips-to-overcome-jet-lag/