But the ideas come to me suddenly, usually when I am outside the flat, staying somewhere else, or at the theatre, an exhibition, walking in the countryside, reading an article or a book. I think stability and familiarity are good for the actual writing process, but change, unusual environments and exploration do stimulate the production of ideas.
I call these "brainwaves" because they do come in waves, and I usually get ideas for several books at the same time.
During my recent stay in North Devon, I woke up at 6.30am and thought about the various ways I could sell/promote my books, then several plot lines for The Book of Thoth materialised in front of my eyes, and then some background biography details for some of the characters in The Right Place appeared out of nowhere.
I have two days of writing in front of me this week. Better make the most of it!