Horses can sleep standing up by locking their knees to keep from falling over.
Horses
Cows can sleep standing up by leaning forward and locking their hind legs.
Cows
Elephants can sleep standing up, especially if they feel threatened. They have strong legs that allow them to stand for long periods without using much energy.
Elephants
Goats can sleep standing up, especially if they feel safe.
Goats
These animals often sleep standing up, especially in a herd.
Llamas and alpacas
Camels can sleep standing up by bending their knees and resting their heads on their bodies.
Camels
This information is not DNA’s opinion but obtained from media reports.