Most people picture sleep as a single block of rest at night, maybe stretched a little longer on weekends. Penguins live by a different rhythm. Their idea of rest is broken into countless flickers of ...
Nodding off is dangerous. Some animals have evolved extreme ways to sleep in precarious environments
Every animal with a brain needs sleep — and even a few without a brain do, too. Humans sleep, birds sleep, whales sleep and even jellyfish sleep. Sleep is universal “even though it’s actually very ...
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