I usually fly SFO to HKG leaving just after midnight, and my strategy is to stay awake as long as possible. If I can stay up for 3-4 hours, I'm usually so exhausted that then I'll sleep for 7+ hours and then I only have a few hours to kill watching movies-- sometimes I'll take a little nap before landing. Arriving at HKG at 6am, that's just about perfect. Happy flying!