Tough week for an introvert; I've had to be "on," in conversation, engaged and present almost continuously. I didn't have to journey very far or do a lot of physical activity, but I feel more drained than I would if I'd been hiking all week. By Friday / Saturday, I felt distinctly like I was interacting with people underwater or from a long distance away - my brain had started wandering off the leash whether or not I gave it permission, the way it does when I haven't slept enough.
All of which to say - the words I have left, I should use for writing. To it, then.