I continue to think that the death of printed books is hugely exaggerated. And here’s the latest reason why I continue to believe that:

Apple’s iPad can do movies, music, e-mail, apps and rich Web browsing. And of course, e-books. Should Amazon just put its comparably basic e-reader, the Kindle, to sleep?

Not so fast. Sleep experts say using the iPad before bed can affect sleeping habits unlike most other e-readers. . . .

Light-emitting devices, including cellphones and yep, the iPad, tell the brain to stay alert. Because users hold those devices so close to their face, staring directly into the light, the effect is amplified compared with, say, a TV across the room or a bedside lamp, said Frisca Yan-Go, director of the UCLA Sleep Disorders Center in Santa Monica.

And, of course, printed books are absolutely, positively guaranteed to not give you cancer.