It's been difficult because of various other interruptions, which I won't go into, but at least I can take some satisfaction in meeting multiple deadlines.
There's another nonfiction coming up, but it should be easier (similar to one of the others) and the deadline is more than 7 days off. This means that for a few days I can go back and relax by finishing a scene I started weeks ago on Book III. I spent some time in a waiting room working on it in the ubiquitous notebook (not electronic--old-fashioned "composition book".) I think some of the other people waiting were confused by the mix of furious writing, staring into space, and cryptic sketches, but...they should be glad I refrained from talking about it.