Some animals, such as birds, dolphins, and whales, can engage in unihemispheric sleep, in which one hemisphere of the brain sleeps while the other hemisphere remains awake. Staying half-awake allows animals to literally "keep an eye open" for predators, and for migrating birds, allows for uninterrupted flight for days or even weeks on end.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/3103INS
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