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Re: Evolution of sleep
<<REM sleep is much more common. Crocodiles and very young birds show it,
and I forgot what else.>>
I wouldn't be surprised about that, David. However, the question concerned
<<Sleep per se is common to all... vertebrates?>>
This must be another interesting question, because I don't know the answer
either. Happily, there's a good chance somebody else will be able to
enlighten us both. That's the great thing about ignorance. It leaves
plenty of room for learning new stuff.
The Mesozoic - more than just the dinosaur.