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Søvn kunne være evolutionens største fejltrin nogensinde. Hver aften må vi give efter for denne biologiske trang til at lukke øjnene. Over 80 år bliver det til 10.000 sengedage eller en tredjedel af livet, vi kunne bruge til noget mere fornuftigt. Christine Parsons, utrættelig psykolog ved Aarhus Universitet, ligger dog ikke søvnløs over at knalde brikker. Søvnens fordele opvejer langt dens ulemper. Mens vi snorkbobler, genopbygges vores hud og muskler, og hjernen bortskaffer affaldsstoffer...