This really did just happen to me, and it really was quite exciting. (pitiful). So, for all the other medical students out there studying for boards, here's a question for you:
While flipping through flashcards on a rainy afternoon, I fell asleep curled up on an arm chair, with my right arm, held in flexion, between the chair and my body. When I woke up and stretched, I realized that part of my right hand felt tingly and my 4th and 5th digits did not extend with all the rest. Name that brachial plexus lesion!