I learned to sleep in public in college. This may have been my downfall at my first college.
Bunbun, I also developed the skill of being able to catch a "combat" nap on a busy flightline full of fighter jets coming and going.
I was stationed on an aircraft carrier for years. My rack was directly under the flight deck between the #3 and #4 arresting wires. I learned to sleep with F-14s and A6's landing, literally, three feet above my head. Slept like a baby, too.
But in port, if there were welders on board, some dude with a little hammer up there "tap tap tapping" some weld would wake me up in about two seconds. Used to drive me nuts.
Someday we'll win this thing...