<![CDATA[This study explores the phenomenon of day and night in the Qur'an as a conceptual bridge connecting sacred texts with modern science within the field of Tafsir studies. The urgency of this research lies in its capacity to integrate spiritual interpretation with contemporary scientific insights, particularly regarding Earth's rotational dynamics and human circadian rhythms. Utilizing a descriptive qualitative method through library research and thematic (mawḍū‘ī) exegesis, this study synthesizes Qur'anic verses concerning time with the latest biomedical and astronomical literature. The findings reveal a strong alignment between the Qur'an's description of time transitions such as the cosmic rotational concept of yukawwiru, alongside subāt and libās during the nocturnal resting phase and human neuroendocrine mechanisms, including melatonin synthesis and cortisol regulation. This interdisciplinary approach not only enriches the simultaneous understanding of theology and science within Hadith and Tafsir scholarship, but also offers practical implications through the Theo-Circadian Sleep Hygiene concept for healthcare and integrative curriculum development in education. Ultimately, this study concludes that absolute harmony exists between Qur'anic texts and modern science, providing a robust foundation for humans to harmonize their life rhythms with the earth's natural cycles to overcome modern health crises.]]>
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