And who makes you study continuously and go crazy?
Everything should be in moderation, take breaks, give your brain a rest, but you understand that if you work for a long time without stopping, your efficiency will begin tends to zero.
Switch attention. I remember at university I had to study and review a huge number of books on the history of religion in a few days. In order not to go crazy, I took a few additional books and a radio. I read for an hour on the topic, then I take and swallow a chapter from "Countess de Monsoreau", then again an hour on the topic and already take up a book on American history, then I listen to the radio for another hour and 10 minutes, then another hour and I swallow a chapter from a detective story or fantasy etc.