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One hour’s screen use after going to bed increases your risk of insomnia by 59%, scientists find.
(www.frontiersin.org)
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They could have had them not use a screen for some parts of the study and use it for others, but after reading the article and skimming the paper I can't see any indication they did this. It seems they just sent out a survey to 45k people and concluded people who use their phones in bed go to sleep later so that must be the cause.