I always take the night departures out of HKG so after a hard days work, dine in the lounge and have shower or bath before flying. Get on board, get the PJ's on and as soon as they turn off seat belt signs get my head down. After say 7 or 8 hrs sleep get up and change back into clothes and have a light snack of fruit and tea and either relax or work for rest of flight. By the time I get off in LAX or SFO and get to hotel I usually go and chill out for about 90 mins and go back to sleep and get up nice and early next morning. If you have your onward you might be able to get a shower at SFO or LAX and then onward flight and try to get to bed about 9 30 PM first night back in USA