Alarm which could Ring even when Device is Off Android smartphones are smarter than traditional mobile phones in all aspects, but I am unable to find this smartness in one aspect: In those classic mobile phones, there was an option to ring the alarm even when device was off. The device was turned on temporarily to ring alarm, then turned off.

How to do this in an Android device? I know, its not possible by app unless supported by firmware. So, I am asking for ROM hacks etc.

Please, don't answer if its "You Can't" or "Not Possible" etc..
NoMoarPowah! (alternative link) can boot the phone up based on your scheduled alarms, in time for them to ring.  It only works on certain Samsung devices.