Write now. Procrastinate later.
My old favorite was a Twain quote: “Never put off till tomorrow what may be done day after tomorrow just as well.” So far that one hasn’t helped me finish my dissertation, so it’s in with the new.
Progress report: I’m still slogging away on revising my ER chapter. Between weird childcare schedules, hard problems to fix, and summer, work has been slow. But today I finally procrastinated with all the appealing things, so I’m ready to dive in to working. I’d love to have the draft sent back to my advisor by Monday morning, but we’ll see.