I did something similar this morning. I became lucid and, after walking around for a while, I saw my pc, which was on. For some reason I decided I should shut it down (I think I wanted to see if it would still be shut down when I woke up >.<), however, it refused to shut down and when I started thinking more deeply about how I could get it to shut down, I woke up ._.

So yeah, I guess we need to realize we can do anything we want while dreaming without having to tend to things we don't want to do beforehand ^.^)b