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Old 12-23-2014, 06:52 AM   #11
mr ploppy
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Posts: 3,622
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Join Date: Jan 2010
Location: Yorkshire, tha noz
Device: 2nd hand paperback
Check the footnotes of the original "research": "Dr. Czeisler received royalties from McGraw Hill, Penguin Press/Houghton Mifflin Harcourt"

And the research data: 12 people over 5 days.
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