Mike Lingle

“But I could get back to sleep after one of those mock exercises at once; I had learned to sleep any place, any time—sitting up, standing up, even marching in ranks. Why, I could even sleep through evening parade standing at attention, enjoy the music without being waked by it—and wake instantly at the command to pass in review. I made a very important discovery at Camp Currie. Happiness consists in getting enough sleep. Just that, nothing more. All the wealthy, unhappy people you’ve ever met take sleeping pills; Mobile Infantrymen don’t need them. Give a cap trooper a bunk and time to sack out in it and he’s as happy as a worm in an apple—asleep.”
― Robert A. Heinlein, Starship Troopers