One of the students who is really good at helping everyone out had me so confused because he over-complicated the problem. It wasn't until I took a step back and realized that he was trying to do something that didn't need to be done (the question didn't ask for it) that I finally was able to move on with the question.
So its 10:30am and I have now had 3 coffees and am onto my first can of coke for the day. I feel shattered. I didn't get to bed before 3am over the entire weekend.