It's a dangerous world out there, with predators always lurking. So what on earth would give every single animal in the kingdom the gumption to think it could lay itself down each day, let down its defenses, and go to sleep? Well, turns out that many species might not be ...
Sleep is one of science's greatest mysteries. This hour of Radiolab, we look for answers in iguanas who doze with one eye open, new parents in the throes of sleep deprivation, and rats who may be dreaming.
