The Apple Health tracks sleep by gathering data from your iPhone, Apple Watch, and connected third-party sleep apps. If you wear your Apple Watch to bed, it uses motion sensors, heart rate monitoring, and even noise detection to analyze your sleep patterns. The data is then synced with the Apple Health app to provide a clear picture of your sleep duration and quality. Sleep tracking begins when you set up a Sleep Schedule in the Health app or through the Sleep app on your Apple Watch.
