I think that part of it was that I was so intent on getting so many different things fixed and ready that I both wore myself out and didn't take the time that I should have. I should have realized that the fan was not correctly situated. I know that I've been tired. I was having trouble staying awake during my prep time today and a couple of students said I looked like I wanted to go to sleep. I've also had a hair trigger temper.
It was enough that I came home and took a nap (I try to avoid them as they mess with my sleep schedule), which I had a hard time pulling myself out of so I could get dinner for the boys, have them work on their homework and chores, and get them ready for bed. It certainly is more difficult with Janelle working in the evening.
Well, tomorrow is a new day. Perhaps I can approach it with renewed vigor ... or perhaps some caffeine.