Turns out that lying down to catch some Zs is not universal. Some animals skip the whole “horizontal nap” deal and snooze upright like it's no big deal. It's a quirky, gravity-defying habit that makes ...

Cats are famous for their ability to nap anywhere and everywhere, but horses have a cool naptime trick too. They can get some shut-eye while standing up! (Why couldn’t humans have inherited this ...