It consumes a lot of energy from the phone. The phone must have the screen on the all time and that makes the phone warm up to much. It already damaged my phone after using the app 3 nights in row. When the baby awakes, either you have a crying baby that makes a lot of noise when he wakes up, or if your baby simply starts moving but doesn’t cry, the app detects it but there’s no way of setting an alarm, which means that if it’s during the night, you won’t wake up, as it only comes up light in your screen.