I well remember the feeling of complete despair as I sat down and contemplated 13 or so hours to SIN or BKK.
I feel your pain, I only go once a year but I'm beginning to hate the journey. Four times a year must have been hell. Doesn't matter what class you're in, even on the 2200 departure from Heathrow being able to get your head down after a couple of hours and sleeping solidly for six still leaves you with another five hours when you wake up. It's that sinking feeling when you look at your watch...my wife says she would pay good money for an injection to knock her out the whole way.