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Also asked, is it OK for a horse to lay down?
This is somewhat of a myth. Horses can get a lotof sleep while standing up, but they lie down when theyrequire REM sleep. Typically, the amount of REM sleep they requireis very small, so they don't need to lie down often.However, many horses lie down just because they feelcomfortable or want to do so.
Besides, why is my horse laying down so much?
When a horse is standing at rest, he is able tolock his kneecap with ligaments and tendons keeping the joints inalignment. Horses can't attain deep REM sleep by standing;this is only accomplished when the animal lies down.Therefore, horses do lie down to get proper sleep.They just don't do it for very long.
I think you meant to ask why do they die ifthey lay down for to long. It's simple. Horses aresuch large animals and the weight of their body in and of itselfcan prevent blood flow to certain locations. This cancause severe problems when they try to stand up again, andblood flow tries to return to normal.