iPhone
If you and your Partner use Sleep Cycle with the microphone as the motion detector, the two installations can link both phones over Wi-Fi. This contributes to a more accurate sleep analysis and prevents your Partner’s sleep sounds from interfering with your statistics.
Using this link technology, we can detect where in bed a sound originates with an accuracy of 30 cm (1 foot).
The link feature is for those who share a room or bed. It won't affect you if you're not in the same room, and your data will still be private.
You enable the Partner linking by going to: Profile > More > Partner Linking.
Android
This feature is not yet available for Android users.