NightReader

Do you love listening to audiobooks, but hate finding your place again after falling asleep or leaving your phone? Well you're in luck! Nightreader is the player that also listens to you. If you fall asleep, you stop moving. If you stop moving, the player stops playing.

This application uses the accelerometer inside android phones and other mobile devices to detect movement. When you fall asleep, you will no longer be making small movements that will keep the player playing, and it will automatically pause. You can resume playing from where you left off at any time

You are also able to disable the sensor whenever you choose.