For millennia, historian Roger Ekirch explains in his book At Day’s Close: A History Of Nighttime, humans slept in two phases ...

"Sleep researchers and clinicians have long understood the role of worry in sleep disturbances," says Dr. Michael Gradisar, ...

Scientists have revealed how much sleep Americans are getting compared to other countries across the globe as a new study ...

In Kalibo in the Philippines, a playful cat really got on her owner's nerves on April 28. While the woman wanted to sleep, ...