Why Do All My Blogging Juices Go?

When school starts why can't I suck up anything to write about? I guess my creative juices, I mean dribbles are sucked up for classroom activities. I spend 1.5 hours Wednesday night coming up with an activity for my students because I could see they were having a hard time getting a concept. Then last night I left school at 6 p.m.   School...hmph.