Now we're ready to start the sleep mode. You should start this when you are ready to go to bed--if you're not yet you can come back by later visiting sleepplus.appspot.com
The first step is to calibrate the sound volume. Place the device on your mattress, in the same place it will be while you sleep. Lie down in your bed and then tap the "Calibrate sound" button.
Tap the button below as soon as you hear the device make a sound. Make sure the device is unmuted. It may take a minute before the sound is played.
Now we need to activate your device's motion sensor. To start, click the button below. You might be prompted to allow access to the sensor.
All set! We're ready for you to go to sleep. Place the phone on the bed with the screen on (you can place it facedown). We also recommend keeping the phone connected to the charger. When you wake up in the morning, tap the button below.