Another factor for me being tired is the class that I am teaching. Not because they are horrible students (in fact, today they were nigh on perfect) but because I am such a high energy teacher, who bounces around the classroom like a chihuahua on crack....... in heels.
It is because of this class, though, that I've been studying as much as I have been because it's in the late afternoon so I usually have a decent amount of time with nothing else to do. This means that I haven't been rushing through my homework assignments, that I have studied for the quiz for about 2 hours already, and that I've started doing some supplementary reading in the TESOL field. So despite the physical and mental exhaustion, teaching this class has been really good for me. Not to mention the fact that it pays $13.75 an hour.