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Originally Posted by Shoehorn
Not sure, I mean, there are animals that sleep standing up, fish have to keep swimming when they sleep else they die, maybe we only sleep laying down because we are so used it? Maybe we can train ourselves to sleep standing up, I dunno. It might be fun to try though.
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Horses can literally "lock" their legs...it requires no effort...
"Horses have a unique system of interlocking ligaments and bones in their legs, which serves as a sling to suspend their body weight without strain while their muscles are completely relaxed. Thus, horses don't have to extent any energy consciously to remain standing - their legs are locked in the proper position during sleep."
although some horses lay down to sleep