From The Writing Cooperative:
1. You haunt libraries. You have always haunted libraries and walked, rapt, around bookshops (sometimes secretly smelling the pages of a book you’ve freshly opened, when you think no ones looking).
2. Your favourite people are often fictional characters. Their stories sometimes haunt you — and often you can’t sleep at night due to your feelings about those characters dilemma’s. They might even be your own fictional characters.xx
. . . .
8. Your characters often come alive and start doing their own thing. When you next sit down to write, you are catching up with what they have been up to, rather than making them do things.
Link to the rest at The Writing Cooperative