Sorry you're having insomnia problems, HeyJude.
Well, I got the comment "No, I wouldn't read on," had a major freak-out, found out who the Secret Agent was, calmed down a bit, revised like a maniac with much help from my crit group, and came up with a better, smoother 250. Whew! Now I feel all bright and shiny again.
I finished revising Ch 13, too. My betas are reading faster than I'm revising. They're closing in, and I have to get a move on to beat them to the end and not keep them waiting for the chapters. Onward ho!