Worked at one of the libraries on campus two semesters ago. The only shift available was 8 am to 1 pm on Saturdays. I'm not really one to go wild on Friday nights anyway, but the few times I did stay out late it was absolute hell getting up the next morning.
The neat thing about those library jobs is that you can goof around on your laptop when there's down time. On my first shift, no one came to our department of the library for the first 4 of of 5 hours there. Practically got paid to play X-Com the whole time.