Sleep tracking guides

Plain answers about tracking your sleep with the iPhone you already have.

• How to track your sleep on iPhone without an Apple Watch

  The four ways to track sleep with just an iPhone, what each one can and can't tell you, and how to pick the one you'll actually keep using.

• Does your iPhone track your sleep automatically?

  Not on its own, in the way most people expect. What the Health app's Sleep section actually shows, where that data comes from, and how to get automatic sleep data without a watch.

• Sleep tracking for night shift workers

  Why most sleep trackers get shift work wrong, what's worth tracking when you sleep during the day, and how to read your numbers when your schedule keeps changing.

• How accurate is sleep tracking with just your phone?

  What a phone can and can't measure about your sleep, what research says about consumer sleep trackers, and how to use the numbers so they're actually useful.

• What is your body clock, and why do weekends shift it?

  Early bird or night owl, explained without the jargon. How your body clock is measured from your own sleep, why weekends move it, and what that shift means.