After doing cram sessions for my exams, I've started to fall asleep during the reading of the materials I was supposed to memorize without even noticing it. The

After doing cram sessions for my exams, I've started to fall asleep during the reading of the materials I was supposed to memorize without even noticing it. The interesting part is that I would reiterate over everything I read so far in my dreams after which I would wake up and figure out that I actually fell asleep. Everytime after such short power naps, I had much better recall of information I've retained and I felt refreshed and relaxed.