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Causal claim: When people use their phone or laptop in bed before falling asleep, blue light from the phone causes them to have trouble falling asleep. You can avoid this outcome by switching your phone to “night mode” or “night shift”, so that the phone screen emits much less blue light.
Read the following two articles.
Newsom and Singh:
https://www.sleepfoundation.org/bedroom-environment/blue-lightLinks to an external site.
Reynolds:
https://theconversation.com/how-much-does-your-phones-blue-light-really-delay-your-sleep-relax-its-just-2-7-minutes-236066Links to an external site.
In a maximum of 400 words, answer all of the following questions.
1) Do Newsom and Singh accept the causal claim above? Does Reynolds? Who do you think is right? Explain why.
2) Does Reynolds think that exposure to bright light has some effect on sleep?
3) Using the terminology that we used in class, describe an experiment that you would design to test whether blue light from phones does cause people to have trouble falling asleep.

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