 I really recommend this book by Roger Eckrich about it. It's called At Days Closed, Night in Time's Past. It's about the history of sleep, and it's really fascinating. Maybe you could get up in the middle of the night and read it. That sounds like a good idea. At Days Closed, okay. I don't know that we've named that period between the first and second sleep, but it must be encouraging to know that many other people have that. Indeed, and it's interesting that it would actually have a word,