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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
only mammals.

<<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.

Mesozoic Eucynodonts
The Mesozoic - more than just the dinosaur.