it helps them to stand up
Animals on four legs can balance while asleep, so many of them do sleep standing up, Most especially you will see this in prey-type animals like horses, which would have a need to start running at any second if a predator jumps out at them.
Well if horses didn't have a back, then they wouldn't be able to stand up. It is the same for most animals with vertebrates.
NO! Never stand close to a horses` butts.
Horses are most active in the daytime, eating, sleeping and playing among the herd.
Sleeping birds stand on one foot.
yes it is perfectly fine you just have to stand up when they pee.
Giraffes usually sleep standing; however, they also can sleep while laying on the ground. The rest their heads on their hind legs. Look at the related link below for a photo (scroll down to see it).
Horses rest one leg at a time.
31 horses died
Yes, most horses typically stand by bracing their front feet and then rolling their hindquarters to set their hind feet underneath them.
Arabian horses sleep like most other breeds of horses. Horses can doze on their feet and take little 'cat naps' throughout the day. They will spend a couple of hours on the ground sleeping in a 24 hour period. Most breeds of horses follow this same sleep/wake pattern.