Why do horses nap while standing? Mainly because sleeping while lying down can be dangerous. It takes a bit of work for horses to get up, which makes them vulnerable to attacks by predators. To protect themselves, horses instead doze while standing. They’re able to do this through the stay apparatus, a special system of tendons and ligaments that enables a horse to lock the major joints in its legs. #blankpicture #perezhilton #binbin #spokanewashington