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 ...

Wild orcas are not known to attack humans, but that’s partly because most humans are sensible enough not to jump into the ...

Across the UK, a quiet shift in midlife exercise is underway. A decade ago, the cultural image of midlife fitness was the ...