Sleep is something we all do every day, yet it’s surprisingly complex and full of mystery. While it may feel like nothing ...

The “Sleep Score” is one of Fitbit’s most alluring metrics that people like to compare and improve on. Fitbit is now testing “Sleep Animals” as a friendly but surprisingly smart way to encourage ...

Learn facts about sleep, during which the body rests, recuperates and performs essential repairs. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.