Cramming at the library

It's midterms week here at SEBTS. I've been studying a lot, and not doing much else. Last Saturday I spent several hours there, trying to get a thesis proposal worked out (because assignments don't take a break for midterm exams). I wasn't planning on doing anything that night, besides studying, so I took a study break just to say hello and let the parents know I'm alive once I left the library. Here's the conversation:

Dad: Hey buddy.
Me: HI dad! How are you?
Dad: I'm good. We worked around the house today. What did you do?
Me: Oh, just studied. I have midterms next week, and assignments. So I spent most of my day at the library.
Dad: Ok. You got tired of studying? It's only 5.
Me: I had to leave at 5. That's when the library closes.
Dad: Wow. How different from FIU.I remember when you would pull all-nighters there.
Apparently I was on speakerphone, because at this point I heard my mom laughing in the background, mockingly saying:
Mom: So, she pulled an "all-afternooner."

I don't know what it was, but it made me laugh so much.
Oh, this school that I go to. And this library that they have, with their odd "hours"...