How animals sleep can reveal a surprising amount about their health, mood, and personality. Dogs, in particular, show a wide range of sleep behaviors — from deep REM cycles to quick, light naps — and ...

Some animals do it for survival, while others have evolved this ability for different reasons. It might seem strange, but these animals have developed abilities to rest while staying alert to their ...

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 ...