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1. Horses can sleep standing up by locking their leg joints.
The stay apparatus is a group of ligaments, tendons, and muscles which “lock” major joints in the limbs of the horse. It is best known as the mechanism by which horses can enter light sleep while still standing up. It does, however, exist in other large land mammals, where it plays a role in reducing fatigue while standing. The stay apparatus allows animals to relax their muscles and doze without collapsing. ”Horses are able to sleep lying down as well”.
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