The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
if you use let's say an iPad for an hour before bed first you get about a 50% drop in the amount of melatonin that's released so you lose 50% of the signal of sleep timing worse still that melatonin peak even though it's lower to 50% lower it will arrive 3 hours later at night so it's so mistimed by the the perverse impact of the screen
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
iPad reading dropped or blunted melatonin by over 20%. The peak of melatonin didn't arrive until three hours later. This is one hour of iPad reading. They had less REM sleep, and they...
When they woke up the next morning, the people who read the iPad felt more unrefreshed. They subjectively knew that they had not slept as well. What was interesting is that when they stopped the iPad reading, there was a washout effect that was a blast radius of reading the iPad. And it's continued into subsequent nights even though they'd stopped reading the iPad.