Under the tab Settings, go to Heart rate and change the settings to On.
If the Heart Rate Monitor still doesn’t work, you need to allow Sleep Cycle permission to use the camera.
Go to: Settings > Privacy > Camera > Turn on permission for Sleep Cycle
Users who activate heart rate reading will be asked to place their finger on the camera lens to record their wake-up resting pulse. Their heart rate will then be included in their sleep analysis graphs.
This feature is yet not available for Android users.
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