Where is this energy coming from?

I went to an informal improv class today. Or at least part of. I would have like to have been there on time, but the aforementioned run took precedence. It was nice, but it has been about a year since I last did improv. Rusty did not begin to describe it.
Still, fun was had by all.
Now, for the first time in years, I am not having pasta on a Saturday night while I am at home. Since I have always done a long run on Sunday morning, pasta was a good source of calories. But since I did the run this morning, I get to have variety.
Ironically, my dinner-of-champions yesterday was poutine. And for lunch today I had a boost drink. It was dangerous, because last week I saw a friend drink one while on the run and end up with horrible stomach problems. Hasn’t affected me. So far.
I am really looking forward to being able to sleep-in tomorrow. And because I can, I get to stay up late tonight. Swing dancing, here I come.