Plees Tracker is a simple sleep tracker for your Android phone. This is meant to be a very simple open source clone of PrimeNap, i.e. just track sleep start/stop times and count the average / day. Features: - It literally does nothing while you sleep, causes no battery drain. - Stores past sleeps, counts stat from them (average). - Exports/imports sleep data to/from CSV. - Can show past sleeps, can selectively edit and delete individual sleeps.