The Apple Watch is now a powerful sleep-tracking tool – and its built-in capabilities are now much improved.
But the beauty of the Apple Watch is that there's a rich ecosystem of third-party apps, which expand the feature set beyond the standard watchOS experience.
Another on-watch app for tracking bedtime slumber, Sleep Watch automatically keeps tabs on the time, heart rate, and stages of your sleep.
It looks for dips in your heart rate that the makers suggest correlate with more restful sleep and will give you a score based on the quality of your nighttime hours.
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