A study identified five sleep types that could be linked to mental well-being, bedtime habits and brain activity. The ...

These top-rated sleep trackers make it easier to monitor your rest and improve your sleep habits by using cold, hard data.

The middle of the night used to be my special time. I’d use it to cram for a test, read a mystery, or play Candy Crush—with no one around. As I got older, those nighttime hours became time to answer ...