People with the condition do not fully close their eyes while they sleep ... open. It’s a condition that captures the ...

Most animals close their eyes when they sleep. But did you know some amazing creatures can actually sleep with their eyes open? It might seem strange, but these animals have developed abilities to ...

But unlike humans, birds can sleep with one eye open, keeping one half of the brain somewhat alert while the other sleeps deeply. This balance between vigilance and deep sleep helps them stay ...

They also sleep with one eye open sometimes. Flamingos make standing on one leg look easy—and they do it while sleeping. Their locking joints let them stay balanced with zero effort. Plus ...

Dolphins sleep with one eye open, giraffes get about 20 minutes of ... these creatures have got to sleep down to an art. Get ready to explore 7 of the weirdest sleep habits in the animal world ...