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I don't know about this tuner crap, but I use Sleepy Time to get to sleep. You can play a ton of different calming sounds (and combine them) to listen to while you get to bed. I fall asleep to the rain every night.
Edit: Also, upon further inspection it seems the Brainwave Tuner app isn't free at all. It is just some trial that will eventually tell you to upgrade according to the comments in the Market.