Horses sleep standing. A horse tomb rarely and when it does for a long time is a symptom of disease. The legs of horses consist of a series of ligaments that allow these maintain a position on all fours station during sleep without tiring (since only muscles involved in this position) without being fully aware.
Besides the horses do not sleep long hours like people, but stick small nod of minutes, because as an animal that can serve as a dam must be aware of the arrival of potential predators ever.
Depending Blackness look better or worse at night, but the night vision capability is similar to that of humans and other diurnal animals. "
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