Sleep is a fundamental biological process essential for physical and cognitive well-being, playing a crucial role in memory consolidation, emotional regulation, and overall brain function. Nevertheless, very limited research has been conducted on how sleep affects the memorising of the Quran, despite its importance. The objective of this study is to review the role of sleep in memorising the Quran. This study utilised a review analysis method to study the relationship between sleeping and the memorisation of the Quran. The review analysis indicated that sleep plays several roles in memorising the Quran, include: (a) improved Quran memorisation with quality sleep; (b) daytime naps enhance memorisation performance; (c) reduced stress and anxiety through Quran memorisation and sleep; and (d) spiritual practices and sleep hygiene boost memorisation. In conclusion, this study confirms that adequate sleep plays an important role in the cognitive processes required for learning and remembering religious texts efficiently. This review analysis calls attention to the need for more empirical studies investigating the relationship between sleep and Quranic memorisation.