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It's one study. Why are some people acting like there's some grand conspiracy. Good grief. I see this any time anybody says anything negative about ebooks or e readers.
Honestly it's not unreasonable to think having light shone in your face before bed isn't good for your sleep. If light has no effect, why do you turn the light off when you go to bed then? Why worry about disturbing your bed mate. Just leave the light on and tell them they're fine, shut up, go to sleep, and let you read in peace. Where do you think jet lag come from? Your circadian rhythm is tied to light.
Sure the amount of light is excessive. But they probably did that because it's not feasible to put people in a sleep lab for six months and let them read with their normal routine.
There will be other studies. I'd be curious to see what happens if you just have people look at blank screen, emissive or reflective. Also, reading versus other activities, like texting, Facebooking, etc.
The most common health complaint is poor sleep. Much of it can be attributed to poor sleep hygiene. But people just prefer to think it is stress, work, undiagnosed health problems, etc rather than their bed time habits.
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