I'm currently three quarters of my way through a masters degree, and I stopped reading for a couple of months due to sheer exhaustion, and because I was always busy. When I had free time, I wanted to do something that was easy.
Nothing really snapped me out of it, I just forced myself to start reading again because I needed some escape. I began with easier books that didn't require too much effort to read.
I've also had it before when I had a "book hangover" and was still too overwhelmed by my last book. Sometimes I would just reread the last book again which seemed to help. Othertimes I'd just wait it out.