The Sleep Stages feature works with the new Alta HR, Blaze and Charge 2. Sleep Insights, on the other hand, is comatible with all trackers except the Zip.
Sleep Stages
In its blog post announcing the new features, Fitbit explains that the Sleep Stages tool combines data from your movement and the heart rate sensor to help you see the span of time you spend in light, deep and REM sleep. It only works with the Alta HR, Blaze, and Charge 2.
Sleep Insights
The Sleep Insights tool offers suggestions for exercise to get more sleep by combining your sleep data with your diet and fitness activities. Sleep Stages and Sleep Insights are now available in the latest update to the Windows 10 app.
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