I've just given myself permission to wait until I finish one big dream before starting on the next. But I was just sitting there a couple of days ago and I had an idea.
It was an idea that changes my original Nano story a little, but it's basically the same. It just makes it better. I wrote it down and then gave myself permission to forget about it.
But then I had another idea for the same story the next day. Again, I wrote it down and gave myself permission to forget. Maybe this is how it's done.