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<p>Not everyone is a morning person, and not everyone can stay up past midnight. How hard-wired are our internal schedules?</p><p>It’s long been suspected there was an evolutionary advantage to humans falling asleep and waking up at different times.</p><p>Norman and Tegan unpack what are called chronotypes, and whether you can shift yours to better fit your lifestyle.</p><p>References:</p><ul><li><a href="https://www.abc.net.au/listen/programs/healthreport/early-bird-trait-may-run-in-families/11427242">Early bird trait might run in families - the Health Report</a></li><li><a href="https://academic.oup.com/sleep/article/40/2/zsw048/2662182?login=true">Genetic Basis of Chronotype in Humans: Insights From Three Landmark GWAS</a></li><li><a href="https://academic.oup.com/sleep/article-abstract/26/4/413/2707852?redirectedFrom=fulltext&login=true">A Length Polymorphism in the Circadian Clock Gene Per3 is Linked to Delayed Sleep Phase Syndrome and Extreme Diurnal Preference</a></li><li><...