If you're anything like me, getting a good night's rest feels more like a distant dream than a part of your daily routine. If you're reading this with groggy eyes and an exhausted brain, though, fear ...

In the sixth century, Pope Gregory I compiled an infamous list of seven deadly sins. Of these seven, sloth is the only sin named for an animal in English. But are these curious animals truly paragons ...

Brown-throated three-toed sloths living in rainforest trees slept at least six hours less than the 16 hours a day previously recorded for sloths in a lab, says Niels Rattenborg of the Max Planck ...