Placement

Sleep Cycle has two motion detection modes, microphone (limited to iOS as of now) or accelerometer.
You can change modes under:

Settings > Motion detection (if Alarm is turned On in Settings).



Microphone for iOS
The built-in microphone is used to analyze your movements as you sleep. Keep the app running in the foreground with the device unlocked. It’s important that you place your phone correctly:



Accelerometer
The accelerometer is used to analyze your movements as you sleep.Keep the app running in the foreground with the device unlocked. It’s important that you place your phone correctly:

Depending on your type of bed and mattress you might find certain placements work better. Please do not place your iPhone underneath a pillow or thick mattress as it can become warm when charging.

If you feel uncomfortable having an iPhone close to your head, you may set it to Flight Mode. Keep the app running in the foreground with the device unlocked. As a bonus this also ensures that no one can bother you while you sleep.

 
 
iPad
The built-in microphone is used to analyze your movements as you sleep. Keep the app running in the foreground with the device unlocked. It’s important that you place your iPad correctly:
 
 
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