Just when you are thinking that it is all over for the Amazon Kindle or any other eBook reader in the market, here comes an interesting information. Sleep experts claim that since the iPad is basically a touch screen liquid crystal display, it is no different than a regular laptop. What that means is that you will still strain your eyes at the end of the day. And the direct exposure to this kind of back-lit display sources inhibit body’s melatonin secretion, the key ingredient for a ‘good night’ sleep.
On the contrary, conventional eBook readers use e-Ink technology, which is smoother on the eyes, more energy efficient and unlikely to strain your eyes. As per the sleep experts it is like a normal paper, which will not disturb the melatonin secretion. Some might find this debatable though. You may think what happens to the bed light you have to keep “on” while reading the other eBook readers? Doesn’t that affect the melatonin secretion? The fact is, it doesn’t.[source: latimes.com]