All of your physical activities will then start to be logged and synced automatically to the app.
Your Fitbit will be smart enough to detect restless sleep through the way your body's moving, and if your wearable has a heart rate monitor built in, it knows what to look for to tell the difference between light, deep, and REM sleep.
Open up the Today tab in the Fitbit app to see the sleep you logged last night, in hours and minutes.
If your device has a heart rate monitor, you get a sleep score as well: This weighs several factors, like the amount of moving you did during the night and the amount of deep sleep you got, to give you a number up to 100.
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