1/2 hour power nap sound good. But naps are strange. If I go in for a nap on-purpose I don't fall asleep. Or if I do fall asleep I sleep for a a couple of hours. If I wake up and its daylight my body freaks-out.

Good for you though - The first thing that comes to mind when you wrote 1/2 power nap, was power steering that most cars have now, or power to the people... I'd better stop. Stopping...