A combination of work play and rest depending on need. The effect of altitude on palete is remarkable: I don't drink bloody mary much, but enough to know it really does taste different at height. And food does, I am sure.

I know I am much more emotionally vulnerable on flights, I cry at the movies, often at the most ridiculous moments: Always been a snuffler for Charlie Chaplin poverty bathos but now, one glance from an actor can get the tears running. Crying at Stewart Little. Or Luke.. I am your father. Or Stewie and Peter having a hug. Insane!

I take frequent toilet breaks. I drink a lot of water all the time. It annoys the living bejesus out of everyone but there isn't much I can do about that and having had Kidney stones on an extended overseas trip I never want to go there again.

Kindles are gold. Better than movies mostly, If you can sleep with headphones on or in, then a kindle and gentle music can work wonders. I've slept through 5 CDs of Vladamir Ashkenazy playing chopin before now (actually, copied to minidisc)

But in the end, there's always Temazepam. 10mg. Some people say Melatonin works for them but my partner had horrid florid nightmares and restless legs. You don't need that on a plane.

Avoid over drinking the booze. And, don't be stupid. The crew have a job to do, and it doesn't include being chatted up, or dealing with your feet intruding through a seat on somebody elses space.

(used to do 10 a year, long haul/international, worldwide for 20 years)