General Knowledge · 2
Which animal is known to sleep standing up?
Answer
Horse
Horses possess a remarkable physiological adaptation called the 'stay apparatus'—a system of tendons and ligaments that allows them to lock their legs in place and sleep standing upright. This enables them to rest with minimal energy expenditure and remain alert to predators, requiring only 2-3 hours of sleep daily split into brief intervals. Horses can also lie down for REM sleep but spend most of their rest time standing, a crucial survival advantage in their natural herd environment.
💡 Did you know?
Horses' eyes are positioned on the sides of their heads, giving them nearly 360-degree vision while sleeping standing—perfect for detecting predators.
Other options people guess
- Giraffe
- Penguin
- Dolphin
Topics
- animals
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