The Sleep Cycle volume is independent of the iOS volume. Sleep Cycle will sound even if your iPhone is muted, you’ve turned off the volume, or if you’re using “Do not disturb”. The volume under Sleep Cycle settings will define the starting volume of the alarm. After awhile the volume will increase automatically until maximum volume is been reached.
The Sleep Cycle volume on Android devices cannot be changed, the volume will slowly increase from the lowest to the maximum system volume.
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