Wait to See How Sleep Tracking Works
A major new Apple Watch feature this fall is likely sleep tracking. The 9to5Mac report details that the Time in Bed Tracking will use various data points to track your sleep and quality of sleep using the Apple Watch. This can include, "movement, heart rate, and noises."
This sounds like an excellent option if you are looking for Apple to quantify your waking and sleeping hours, as it should be able to match up with your Activity, Screen Time and even time spent in your car to give you a pretty accurate breakdown of your daily activities.
In the report, 9to5Mac states that you can choose a second Apple Watch to wear while you are sleeping if you want to charge one overnight. This makes it sound like the feature will be a watchOS 6 upgrade, and not specifically tied to the Apple Watch 5. If you are interested in this, you should at least wait to see what the specifics are so you can decide if you want to upgrade or if you want to keep your old Apple Watch.
The Apple Watch 4 battery life is good enough that I've slept with it on while using third-party sleep tracking apps and just charged it while I showered at night and in the morning.
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