Wearable fitness trackers provide sleep data that can give you insights about the duration and quality of your sleep. A doctor explains which metrics matter the most, and how to use the data to ...

Image of an iPhone (with Health app visible) next to an Apple Watch. (Apple) Apple Health brings sleep tracking, scheduling and long-term analysis into one place, with your iPhone acting as the hub ...

The settings are scattered around your phone and watch. Here's where to find them.