There are probably dozens if not hundreds of posts covering this subject, how to deal with long flights. Check the TravelBuzz, Continental (EWR-HKG), SQ (LAX/EWR-SIN), Trip Reports and UA forums for suggestions. Personally, on this flight, I try to stay awake for the entire flight (read a book, do work, watch a movie), go to my hotel, check in, clean up, eat, go to sleep, wake up, go to work.