the platypus
The platypus, apparently, is a surprisingly deep sleeper. What's more, it
spends more of its time in so-called 'REM' sleep than any other mammal.
These are the conclusions of a study on sleep in the platypus by Jerry M.
Siegel of the Sepulveda Veterans' Affairs Medical Center, North Hills,
California and colleagues. Their report appears in a special number of
Philosophical Transactions of the Royal Society devoted to the biology of
the platypus (Ornithorhynchus anatinus), …
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…sleep on a firmer
footing. It now seems that the 'core' brainstem activity manifested as REM
sleep has extremely ancient roots, going back to the reptilian acnestors of
mammals as well as birds. The elaboration of REM sleep into the forebrain is
a later innovation: but whether it evolved once and monotremes have since lost
it, or if it evolved more than once, is something that only more work on birds
and reptiles can establish.
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