I believe a shark sleeps with one eye open.
It is not possible for humans to sleep with one eye open and one eye closed simultaneously. The brain requires both eyes to be closed in order to enter the deep stages of sleep.
An owl blinks one eye at a time
it has one eye and its HUGE! -P.S. it watches you sleep...
An owl blinks one eye at a time
Dolphins sleep closer to the surface of the water. They always sleep with one eye open and one eye closed and half of their brain working to spot any predators. They keep their blowhole above the water so they can breathe.
Your animal is the eye-eye.
It means you have one eye open. If you mean the idiom "sleep with one eye open," it means that you are staying alert at all times in case of disaster.
Sleep with one eye open
they can sleep long with one eye open -they'll drown if both are closed also their eye is open to sense danger or they'll die.
Oh, dude, wolves don't exactly tuck themselves into bed and sing lullabies. They sleep in short stints, like power naps, to stay alert for any potential dangers. So, technically, they don't sleep with one eye open, but they're definitely not deep in dreamland either. Like, imagine trying to snooze while keeping an eye out for your annoying neighbor.
every dolphin sleeps with one eye open.
keep one's eye on the prizean eye for an eyesleep with one eye openkeep your eye on the ballgive someone the evil eyehit the bull's eyehave a bird's eye viewget some shut eye (sleep)turn a blind eye to