If I can find a copy, I'll scan the "grad school dream" comic I wrote back when I was in my first or second year. It had to do with a quote from a friend in my cohort when we were talking about dreams. I had said, in dreaming about math problems, there was always something in the dream that makes perfect sense as you're dreaming it, but that is completely WTF when you wake up.

Her answer was, "Yes! In the dream you are going along the proofs and then it's like, 'Well, we don't have to worry about that; the giraffe will do that bit'. And you just keep going."

(so afterward, "the giraffe will do that part" became our stock answer to all the homework problems we couldn't quite get)