MedicalConspiracies- Why Are Some People Early Birds and Others Night Owls?

This question originally appeared on Quora. Answer by Suzanne Sadedin, Ph.D. in zoology from Monash University: Advertisement Your sleep cycle is primarily regulated by circadian cloc …

http://www.slate.com/blogs/quora/2014/04/19/sleep_cycles_why_do_some_people_stay_up_late_and_others_get_up_early.html

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