Does Apple Watch Track Sleep?
Yes, the Apple Watch can be used to track sleep. The Apple Watch is fully equipped with the necessary hardware (state-of-the-art accelerometer, gyroscope, and heart rate sensors) to estimate sleep patterns during wear. The Apple Watch does not come out-of-the-box with a "baked-in" feature for tracking sleep, but you can simply download a free third party Apple Watch app available on the Apple App Store to add automatic sleep tracking as a feature to your Apple Watch now.
Use your Apple Watch To Track Sleep Now for free
Our company, Bodymatter, built the very first app to transform the Apple Watch into an automated sleep tracker — Sleep Watch. Sleep Watch lets you simply wear your Watch to bed and effortlessly wake up to insightful sleep details. You can add this feature to your Apple Watch by downloading Sleep Watch from the Apple App Store now for free here:
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From the Sleep Watch Blog