Seriously brain? Right now?
I had reached the stumbling to stay awake stage about half an hour before I got to bed last night (it took me a while to disengage from the game I was playing - while I like the extra layers in XCOM 2's War of the Chosen they do mean you can get hit with a series of actions right after you finish a scenario) and before you can save and log out. So I got to bed, decided I wasn't even going to attempt to read and pulled the covers over my head.
And 5 minutes later semi-conscious brain delivered the first scene for the next novel project. I had a half idea of what it could be already, but suddenly there it was, complete with words, including using the title as the snappy first line. So no option but to crawl out of from under the quilt, haul out the laptop and try and type it in, all while so asleep that I was literally dropping off as I typed. But hey, scene!
"The art of breathing," I said, "is ultimately not to stop. I've tried the alternative and it really, really sucked!"