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 ...

Birds exhibit unihemispheric sleep, a fascinating compromise between rest and survival. One half of their brain remains alert ...

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 ...

Some animals can sleep with just half their brain at a time. Understanding this phenomenon can help us learn more about human ...

Animals have evolved to sleep in extreme ways — for example, taking micro naps during parenting, sleeping on the wing during ...

Spiritual meaning of sleeping with eyes open will help you to understand this mystery. Sleeping with eyes open is not just a myth or a quirky saying. It happens to a lot of people, and it has a ...

Wading through a clear knee-deep tidal pool in coastal Florida, I was trying to move slowly, to avoid disturbing a gorgeous American oystercatcher napping on a small sandbar. Oystercatchers are ...