I think I found 5th gear.
I only hit it for about an hour, late yesterday afternoon, but it's still there, and it would seem still accessible.
I've set myself up here at home to write again, just like last year's prelim essay. The only problem is that there's TV here, as well as a fully stocked fridge. I've yet to turn the TV on today, but I'm about to succumb to the force drawing me to the kitchen, if only to make tea.
I'm aiming for one more full, single-spaced page today.... we'll see if it happens.
ETA: Little bro is settled, and having a blast. Today is his first day of classes, though; that'll be telling ;-)