Just after 22:00, realized that one of the myriad reasons for my unfocused restlessness was the sheer volume of noise that's been present in my apartment. With the heat being what it is (and being another contributor), I've had fans going nonstop. "White noise" is innocuous enough, but for me, even that mounts up after a time and becomes a sensory input to constantly process. So I turned them off and can feel things getting stuffier, but at least I can hear my own thoughts. If only they'd settle down.