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Discuss the Role of Endogenous Pacemakers and Exogenous Zeitgebers Essay Preview: Discuss the Role of Endogenous Pacemakers and Exogenous Zeitgebers Report this essay The sleep/wake cycle is a circadian rhythm, which means that it rotates a full cycle every 24 hours, and is controlled and regulated through endogenous pacemakers and exogenous zeitgebers. Endogenous pacemakers are.