Objective: To explore the Ayurvedic reasoning and physiological basis for allowing Divasvapna (daytime sleep) during Greeshma Ritu, evaluate its doshic and seasonal relevance, and relate these concepts to modern circadian physiology. Data Source: The primary data originates from classical Ayurvedic texts by Sushruta and Charaka, providing foundational principles on sleep and seasonal regimens. Modern physiological concepts, such as circadian rhythm, are also briefly incorporated. Review Methods: The methodology involves a descriptive and analytical review of Ayurvedic concepts concerning Nidra and GreeshmaRitu's characteristics. It systematically analyzes the reasons for Divasvapna's summer recommendation, focusing on reduced night duration, Vata accumulation, and the season's depleting effects. A comparative analysis highlights why other seasons contraindicate daytime sleep based on their unique doshic imbalances. Results and Conclusion: Divasvapna, generally considered improper, is beneficial in Greeshma due to the season's intense heat (teekshnata), dryness (rukshata), and shorter nights leading to insufficient sleep and Vata accumulation. Being inherently unctuous (snigdha), daytime sleep counteracts dryness, pacifies Vata, and compensates for sleep deprivation, helping maintain Kapha and Agni. It is strictly contraindicated in other seasons due to Kapha accumulation/liquefaction, heightened moisture, and Rakta vitiation. Proper Divasvapna in Greeshma should be short (muhurta matra) and ideally on an empty stomach. Ayurveda's approach to Divasvapna reflects a precise understanding of physiology and environmental interaction. By providing unctuousness and compensating for sleep loss during summer, Divasvapna is crucial for maintaining health and balance. Key message: The main takeaway is that while Ayurveda generally advises against daytime napping (Divasvapna) because it can cause imbalance, it becomes a crucial, healthy practice during the peak of summer.