Another thought: has anyone here experimented with a biphasic sleep pattern? I've read several articles that say that research shows that's actually natural for humans. Maybe I should just try embracing the idea of sleeping for a few hours, then waking up and reading a book for an hour or so instead of fighting to get back to sleep, and then sleeping some more when I'm tired enough again. Who knows, I might even come to enjoy it. It should certainly be more enjoyable than lying in bed growing increasingly desperate because I can't sleep. Maybe without the stress caused by that despair, falling asleep again for a second cycle will be easier. Any thoughts?