Weallhaveabiologicalclocktickingawayinsideusthatgovernsourdailyrhythms.Thisaffectsourhealthasmuchasourdietandwhetherweexercise.Sowhatcanwedotomanagethisinternalclockbetter?　　Tofindout,evolutionarybiologistEllaAl-ShamahilocksformercommandoAldoKaneinanabandonednuclearbunkerwithnowayoftellingthetime-fortendays.Monitoredaroundtheclockbyateamofscientists,hecarriesoutabarrageofteststouncoverexactlywhatmakesourbodyclocktick.　　Aboveground,Ellameetstwotime-starvedcouplestotestthelatestthinkingonhowwecanmanageourbodyclocksbetter.Intryingtoimprovetheirsleep,andtheirlives,sheuncoverspracticaladvicethatwecanalltakeonboard.Studiesonshiftworkersshowthatregularlydisruptingoursleepmakesusmoreatriskofdiabetes,heartdiseaseandevencancer.Sogettingtogripswithourbiologicalclockcouldn'tbemoreimportant.