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SARGA.CO – If you've ever visited a stable and spotted a horse standing still with its head lowered and eyes half-closed, you may have wondered if that horse is actually asleep. Unlike humans, horses have evolved a unique sleeping pattern that allows them to rest while remaining ready to react to danger.
As prey animals that spent centuries avoiding predators on open grasslands, horses developed sleep habits very different from most mammals.
While we typically sleep for several uninterrupted hours each night, horses are polyphasic sleepers, meaning they nap in many short periods during the day and night. A horse may sleep anywhere from 20 to 50 times per day, each often lasting only a few minutes, but generally adding up to a total of 5-7 hours of sleep every 24 hours.
Horses can sleep in three primary positions, each having a different purpose.
A horse will stand with its head lowered, eyes partially or fully closed, and one hind leg often resting. To an observer, the horse may appear awake, but it is actually enjoying a light sleep.
This is thanks to a special anatomy network called the stay apparatus, which locks key joints in the legs, allowing the horse to remain upright with minimal muscular effort.
Dozing evolved as a survival mechanism because if a predator appeared, the horse could run away almost immediately without having to get to its feet. Other members of the equine family, like donkeys and zebras, have a similar
In this position, the horse lies on its chest and abdomen with its legs tucked beneath its body. This allows for deeper rest than dozing while still allowing the horse to get back to its feet quickly and flee if necessary.
Many horses spend their non-rapid eye movement (NREM) sleep in sternal recumbency.
The horse lies completely on its side, with its neck, head, and legs stretched out along the ground. While some get alarmed when they see a horse lying flat like this, and occasionally twitching, it is actually normal and necessary behaviour for deep sleep.
Lateral recumbency is the only position in which horses can enter rapid eye movement (REM) sleep, the stage associated with dreaming and complete muscle relaxation.
Horses spend relatively little time lying down due to their size, with a fully grown horse weighing up to hundreds of kilograms. Remaining on the ground for too long may put pressure on muscles, nerves, blood vessels, and internal organs.
Dozing helps reduce these risks while still allowing the horse to recover. Young horses and foals, which weigh significantly less, often spend much more time sleeping while lying down than adult horses.
Although horses get most of their rest while standing, they cannot sleep on their feet all the time. Adult horses require around 30 minutes of REM sleep daily, which can only occur with lateral recumbency.
If horses cannot lie down for enough periods of time, they can become sleep-deprived. In severe cases, they may become very drowsy, suddenly stumble, or even collapse.
For this reason, veterinarians and caretakers pay close attention to whether horses have safe and comfortable places to lie down and sleep.
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