Why do horses sleep standing up.
The horse sleeps standing up, which preserves the habits of the wild horse.
Wild horses live in desert steppes and are the delicacies of jackals and beasts, and their only way to escape is to run for their lives. Predators such as jackals are preyed on at night, and wild horses cannot sleep on the ground at night in order to quickly escape predators, but can only stand and nap and maintain a high degree of vigilance.
Domestic horses were domesticated from wild horses, and the habit of sleeping standing up was preserved. If nothing was expected to be dangerous, it put its head on its back and slept. If you look closely, when the pony and the mare live together, they also put their heads on their backs and fall asleep peacefully. Horses have now been domesticated and live in a very safe environment, so there is no need to be vigilant at all times. However, it retains the habits of the wild horses, and the horses still sleep standing. I spent my childhood in Hengnan Village, Jingxing Mining District, and I often went to the production team's horse shed to play, and I was very curious to see that the horses were sleeping on their feet.
