I went to bed at 9PM last night and woke up at my usual 6:30AM. I was totally out of it most of the day. The previous night’s and that same day’s coding in MATLAB had taken its toll. I started to feel awake after I taught my class at 4PM. I arrived home and got a surprising call from a friend who wanted to have dinner at his house for my birthday which is coming up this weekend. I hadn’t really planned on doing anything, but I was happily surprised.