Why Crafty Crocodiles May Be Sleeping With One Eye Open

Meera Dolasia
2015-10-26T12:38:26-07:00

While for humans the expression "sleep with one eye open" is just a metaphor to keep alert, for some animals it is a way of life. Called unihemispheric sleep, it is the ability to snooze with one eye open and the corresponding half of the brain awake, while the other half rests.