According to the Los Angeles Times, there actually is a difference between reading on the iPad or Kindle. Reading on an iPad before bed keeps you awake because it emits its own light. Light-emitting devices help the brain to stay alert. Devices like Kindle, on the other hand, use a technology known as e-paper, which does not emit its own light and simulates the look of a printed page. This means that you can read on Kindle in the sunlight, and it doesn't put you to sleep.
So whether you read to fall asleep or stay awake, now you know which eReader to choose. However, the paperback still has its own advantages. In case you do fall asleep, you know that it will not break upon falling out of your hand.
I just saw a piece on the news about the iPad causing insomnia...that's also why they say to turn off the TV 30 minutes before you want to sleep.
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