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On 2018-03-14 18:17, Dennis Brasky via Marxism wrote:
Take cetaceans, such as dolphins and whales, for example. Their sleep, of which there is only NREM (non-REM), can be unihemispheric, meaning they will sleep with half a brain at a time!
This is also true of many birds (who are evolutionarily very distant from the aquatic mammals cited here!). This is especially so for migratory birds who must fly 24/7 for days at a time.
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