Some animals, including dolphins, whales, crocodiles, and ducks, can sleep with one eye open. This unique adaptation, called unihemispheric slow-wave sleep, allows them to rest while staying alert to ...

It’s so stressful to wake up in the middle of the night, especially when you know you have a busy day ahead and need as many Zs as you can get. Instead of panicking and watching the clock, many people ...