Yes, though it is really more like the horse is taking a nap. For a horse to get REM sleep they must lay down, typically flat on their sides for a few minutes.
Horses rest one leg at a time.
Horses use all four legs.
YES! I show my horses in them all the time !
NO! Never stand close to a horses` butts.
yes, but not all the time
Not all wild horses have erect manes and not all domestic horses have 'floppy' manes. Some wild horses developed erect manes to help with camouflage and cooling. While domestic horses and other wild horses mainly have floppy manes to help shoo away bugs.
31 horses died
yes , that is all they had back in his time.
All The Gear All The Time
Horse stuff
it helps them to stand up
Well, first of all, humans look nothing like horses. horses stand on four legs. They have a lot more energy than humans, which is why they can run for longer. Horses eat hay and other things that our teeth wouldn't be able to chew. There are lots more reasons, but to many to type all in one here.