Elliot Finer

Yes, I write fiction for fun - and in the hope that my readers will enjoy the books, which, fortunately, does seem to be the case. See elliotfiner.com. My experience exactly mirrors yours, vio88.  Details of the plot seem to be driven by what has just happened, what the characters say and think, and, as you say, what just comes to me - sometimes in the middle of the night! Sometimes the plot takes an unexpected turn - unexpected to me as I'm writing, let alone to the eventual readers. An unexpected benefit of writing fiction has been what it reveals (or hints) about the working of the subconscious. The only problem caused by my aphantasia is in describing locations. I use online pictures to help, but above all I try to convey how the place feels rather than describe details of how it looks. To my surprise, readers have praised the sense of place in my novels.  I say more about some of this on my website.