Dream: History Class

I had one of my "can't find the class" dreams last night. I really hate those. I was supposed to be going to my history class at school after gym class. But I couldn't remember the room (instead of "forgot to study for tests" dreams, I always have "forgot the room number" dreams). I opened up my planner to the front where I always write in the class times and room numbers, but it wasn't there and I was so worried and annoyed. I was walking up and down the history hallway of my old high school, looking in every doorway to see if I recognized people. But I couldn't find the right room and I was sooooooooooo worried because this was going to show up on my attendance record as skipping a class and I've NEVER done that and wouldn't dream of doing that. At one point I was so angry with friends for leaving me while I was in the bathroom so I couldn't follow them to class, and the next moment I was thinking maybe I should just skip. But I couldn't allow myself to do that and I kept looking. Finally I heard a familiar sound- the CSI theme song and I popped in with hope... but I didn't recognize anyone there either and they all looked at me strange. The teacher was a substitute so she couldn't help, but she was fiddling with some gadget and I took it from her and put it back together for her. Then I headed back into the hallway, desperate to find the room. But I woke up before anything more could happen.