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The optimal timing of dark period depends on your schedule. For most schedules, it should begin around 1-3 hours (the default recommendation is 2 hours) before your '''dusk/evening''' sleep (core for [[Special:MyLanguage/Everyman|Everyman]], first core for [[Special:MyLanguage/Dual core|Dual core]], [[Special:MyLanguage/TC1|TC1]], and [[Special:MyLanguage/TC2|TC2]], and evening core for [[Special:MyLanguage/Triphasic|Triphasic]].
