bad dream last night

I had a really bad dream last night:

in the dream I was back in school, got lost and so was late to a class that seemed to be all about taking a pile of objects and making something from them. I had no idea what I was doing, spilled all my stuff on the floor and ended up late leaving the classroom because I was trying to clean up my mess

I keep having dreams like this. Clearly my subconscious is trying to tell me something, and will keep hammering me till I get it, but other than a sense of frustration and failure I'm drawing a blank.