I'd be interested to know exactly what combination of diet, mental and physical cycles leads to nights like this. That is, nights when I'm perfectly sleepy when I get into bed, but then I get less and less sleepy until I'm wide awake again.
Unfortunately, there's nothing deep or interesting flowing through my thoughts at times like this. I'd like to think that if my body/mind is doing everything it can to keep me awake, that it would have something to say. But no.