After you take off the headband, end the sleep session in app or plug it to the wall outlet for charge (this will automatically end the sleep session). Turn on the Bluetooth on your phone, go to “My Sleep” tab in the SleepMapper app, and sync should start automatically. If not, simply pull down the page to initiate sync. Make sure the headband is in close range (within 3 feet).
If you want to sync later, you can end the sleep session by turning the device off (press the power button for 3 seconds), and then turning it back on (press the power button for 1 second) when you are ready to sync later.