Im a cartoonist

Im pretty good I think, I cant ink worth crap though
Anyway, I thought that when you dream it was just your brain collecting and sorting all the thoughts you learned that day. So, if you were to control your dream you would have to concentrate on the dream enough to not wake up(or something like that, read it on the link ninjavenom sent me). But if you are busy doing that your mind wont sort the stuff you learned :/ So would you just not learn anything from that day or what?