Oh, of course that's what's going on. Thank you!

I mean, I knew that being tired meant low executive function meant difficulty getting to bed. In a vague handwavey sort of way. But did I know it in a way I could explain concisely in a single phrase? No, I did not.

Nor had I actually tagged it with an "executive function" label, and that label is really useful because it cross references in my head to strategies to deal with lack of executive function.