Many users asked for the ability to wake up with light. This is possible with the phones flashlight and to start the flash light you need the camera permission. Unfortunately permissions are very rigid and you cannot turn them off selectively and in many cases you need a permission only if you use a very specific sub-feature. For example we need many connectivity related permissions even GPS just to be able to turn on the airplane mode when sleep tracking starts. Please see all our permissions explained in Permissions.