.
...........Maybe I just learned how to pace myself............
A couple of beers at midday, followed by a few hours decent sleep as a result - instead of tossing and turning in a vain hope of getting some sleep, did wonders for the following night flight !
( but don't tell anyone)
...........and why you are still there after 5 days.
When one of my colleagues was about to retire ( at 55 in those days ) his wife was panic stricken - " I married him for Better or Worse" she said "Not breakfast, lunch and bloody dinner "