Hah! guy was thinkin' "Fuck you people and your sleep if I have to work graveyard!"
Once long ago when I was working graveyard for a while I used to tell my neighbors to keep it down till at least 2pm because of said shift. That didn't work at first so, when I started getting home at 6am I'd be outside drinking beer and cranking stuff like AC/DC. As I seem to recall that went on for 3 or 4 days before they got the message.
“There is no such thing as a weird human being. It’s just that some people require more understanding than others.” - Tom Robbins