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Episode 161 - Sleep

The Common Descent Podcast

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How to Sleep With One Eye Open

Animals can't just pass out for three hours. Because you will drown. So they have evolved a way to sleep with only part of their brain at a time. It is called uni-hemispheric non-rem sleep. And then you have the omatic expression. Yeah. You better sleep with one eye open. But it's real. Some animals actually do that. The most famous group for this are marine mails. These are mammals who now face the issue of having to sleep whilst out in the water and still needing to breathe.

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