Take pleasure in the little things. There aren't many big things to take pleasure in whilst in a library.
One of the most enjoyable parts of working in a library is getting to be the person who, at the end of the day, gets to announce that the library is closing in 30/20/15/10 minutes. It's the idea that you get to rip into a noiseless room and shock people, the power trip to say you're shepherding people away, but most of all, it's reminding yourself that soon, you'll be on your way home!!