Learner is dragging this week, physically and mentally exhausted from studying Greek, preparing to move into a new apartment, and not sleeping well. He says he feels he's been hit by a truck. I don't know for sure, but I can't imagine that would feel all that great.
Ecclesiastes 12:11 comes to mind: "Of making many books there is no end, and much study wearies the body." Believe it or not (and according to Solomon), physical weariness can come from intellectual exercise. Learner feels like the poster child for this verse right now.