When animals nod off, they're most vulnerable to sneaky predators. But despite the risks, the need for sleep is so strong ...

Animals that navigate extreme conditions and environments have evolved to sleep in extreme ways — for example, stealing seconds at a time during around-the-clock parenting, getting winks on the wing ...

Officials say a man who is suspected in last weekend’s mass shooting at Brown University and in the fatal shooting of a ...

Animals that navigate extreme conditions and environments have evolved to sleep in extreme ways. For a long time, scientists ...