It doesn't answer your question, but hopefully it's a helpful alternative for you. It has been incredibly helpful for us.
I developed this when I was in academia and it transposed very well (better?) in the software industry. If you do that regularly it also helps course-correct when needed.
Who knows if that is circadian rhythm, conditioning, a combination of both...
This usually means either opening an editor and staring at a blank page (doing nothing), or working on the task.