A new study reveals how mood shifts throughout the day, with many people feeling their lowest at night. Learn why this ...

Dogs may look adorable when they snooze, but their sleeping habits actually hold fascinating clues on how living with humans ...

Here's what experts think about the sound and its potential benefits for people who have insomnia or sleep troubles.

Outside of a handful of valleys in Antarctica, the Atacama is the driest place on Earth. The inhospitable landscape of sand, ...