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 ...

Cats do some pretty weird things. If you share your home with one, you could probably list a few. Sometimes, their behaviors give their owners a good chuckle, like when they sleep in cardboard boxes, ...

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 ...

CNN — You walk over to your friend who is asleep on your couch, snoring away. You bend over to goose him when suddenly you jump back in shock. His eyes are open ...

A recent study observed sleeping participants' pupils during sleep, using a new method that could have implications for studying sleep disorders. Reading time 2 minutes Though sleep is a time to power ...

Dogs’ shenanigans are bound to leave their owners surprised. However, did you know they can even act quirky while sleeping? A recent clip on social media has been capturing this moment in the cutest ...