Horses can sleep standing up or lying down because of the arrangement of the ligaments and tendons in their limbs, which allows them to stand with little expenditure of energy. When resting, a horse usually flexes its hind limb on one side and closes or half-closes its eyes. In this way, it can rest, doze, or even enter one stage of sleep, but the deepest stage of sleep REM or rapid eye movement sleep, in which people (and probably horses) dream can only begin when the horse lies down. He can lie down on his sternum or chest like a cat, by resting his muzzle on the ground, or he can lie on his side. In these positions, he can relax his muscles completely.

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