Have you heard the saying about “sleeping with one eye open”? It’s a bit of metaphoric advice about staying vigilant—and a way to describe very light restless sleep. But sleeping with eyes open is ...

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 ...

Winston Churchill is quoted as saying, "We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." Considering recent events, perhaps we ...