A trio of Caltech grad students noticed some laboratory jellyfish were acting differently when the lights were turned off, and set about determining if they were sleeping. If so, these are the first animals discovered who sleep and have no brain. Anthony and Jeff discuss why a brainless animal would need to sleep, and what that might mean for how we understand our basic human need for it.

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Today’s story http://www.newsweek.com/brainless-jellyfish-sleep-study-668920

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