Does sleep tracking really live up to the hype?

My bedroom has become a sleep lab filled with smart rings, fitness bands, and mattress covers. Here's what I learned.

ATLANTA (AP) — Your watch says you had three hours of deep sleep. Should you believe it? Millions of people rely on phone apps and wearable devices like rings, smartwatches and sensors to monitor how ...

While most smartwatches offer basic sleep tracking out of the box, there are many hidden features that can elevate your experience. Here are some of them.