So my plan yesterday was to take a day with no computer, tablet, Kindle, or physical books in order to get some metacognition done about why I was having trouble getting started on my MIT talk.

Result: Spent almost the entire day lying in bed in a pseudo-REM state, then fell asleep a couple of hours early.

Next day, lo and behold, writing the talk doesn't seem so daunting. I think I was just exhausted, and having access to a computer, maybe even a Kindle or book, was sufficient to prevent previous rest days from being restful.