Most people picture sleep as a single block of rest at night, maybe stretched a little longer on weekends. Penguins live by a ...

WASHINGTON (AP) — It’s a challenge for all new parents: Getting enough sleep while keeping a close eye on their newborns. For some penguins, it means thousands of mini-catnaps a day, researchers ...

In the realm of sleep, humans are monophasic creatures through and through, getting at least seven to nine hours a night. Some of us attempt to break that sleep up into chunks for the sake of somehow ...

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