Benjamin Franklin nailed it when he said, "Fatigue is the best pillow." True story, Benny. There's nothing like pushing your body so far past exhaustion that you'd willingly, even longingly, take a nap on a concrete slab.
“I am Gunnery Sergeant Hartman, your senior drill instructor. From now on you will speak only when spoken to, and the first and last words out of your filthy sewers will be ‘Sir.’ Do you maggots understand that?” said actor R. Lee Ermey in the 1987 cult classic “Full Metal Jacket.”