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internal clock regulates sleep cycle based on 24hour lightdark cycle concept circadian rhythm sleep cycle lightdark cycle biological clock melatonin productioninternal clock regulates sleep cycle based on 24hour lightdark cycle concept circadian rhythm sleep cycle lightdark cycle biological clock melatonin production
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Internal clock regulates sleep cycle based on 24hour lightdark cycle concept circadian rhythm sleep cycle lightdark cycle biological clock melatonin production

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