澳洲陽光海岸大學（University of the Sunshine Coast）睡眠健康教授法蒂瑪·雅庫特（Prof Fatima Yaqoot）表示，在個人鬧鐘普及之前，人們通常透過自然線索與日常作息醒來。「日光是最主要的訊號之一，」她說。「在許多前工業社會中，日常生活依循日出日落的節奏，自然形塑了人體的晝夜節律。」
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