I've been enjoying the Tecnifibre 315 XTC LTD in both 18x20 and 16x19. My all-time favorite in this category is the Dunlop Muscleweave 200g, though it is a bit underpowered and certainly benefits from a hybrid setup.
I once played in an indoor tournament that started at 10 pm and ended at 2 am. The only thing I did differently was that I sipped a coke on some changeovers instead of my usual sportsdrink. I'd probably go with your regular dinner, in my mind it'd be worse to be hungry that late at night.