This is the first of what may become a recurring feature of Plinky answers. Plinky is a question service that prompts writing. And since we're looking for that sort of thing around here, may as well hop on that bandwagon for a bit.
These days, being up at night keeps me up at night. Currently being up. The fear of being up again. Having been up too long already. It's a meta-worry. A worry that devours itself.