“Like humans, horses have both shallow sleep and a deeper rest period of rest known as rapid eye movement (REM) sleep. Horses need about fifteen minutes of REM sleep each day, and they can get that only while lying down.”
Quote by Marty Becker
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Why Do Horses Sleep Standing Up?: 101 of the Most Perplexing Questions Answered About Equine Enigmas, Medical Mysteries, and Befuddling Behaviors
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