Stick to a schedule

on my long international flights I pre plan and adhere completely to my schedule with reward snacks at my milestone marks. For example to Australia - 1 hour of reading, 1 hour of sudoku, 1 movie (glass of red wine reward!) sleep x hours (if you truly cannot sleep it’s headphones and boring audiobook), 1 hour of reading, 1 hour sudoku, 2 hours of sitcom (M and Ms reward! it’s easier to get through if you break it up