I wish that would happen to me. Usually, when I dream up an idea or a premise to write on, it always seems so incredibly fantastic and amazing right after I wake up and can't wait to write it but later on in the morning I realize it's not that good and most of the times doesn't even make sense and it only seemed good because I wasn't fully woken up yet...
Good luck with your novels!
I think it works for me when I sit down to write it out fairly soon--but don't try to keep too strictly to my original dream. That way I mix a little of the original idea with a little sense, and come out with something that might actually be story. Of course, that's only one out of every thousand dreams!