The Caturmasya Observances and the Rite of Vishnu’s Sleep (Aśūnya-Śayana) and Shiva’s Monthly Vows
कङ्काः समं बलाकाभिरारोहन्ति नगोत्तमान् वायसाश्चापि सुर्वन्ति नीडानि ऋषिपुङ्गव वायसाश्च स्वपन्त्येते ऋतौ गर्भभरालसाः
kaṅkāḥ samaṃ balākābhirārohanti nagottamān vāyasāścāpi survanti nīḍāni ṛṣipuṅgava vāyasāśca svapantyete ṛtau garbhabharālasāḥ
“Những con diệc, cùng với sếu, bay lên các ngọn núi tốt đẹp nhất. Quạ cũng làm tổ, hỡi bậc thượng thủ trong các ẩn sĩ; và những con quạ ấy ngủ trong mùa đó, trở nên uể oải vì gánh nặng thai nghén.”
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Dharma is taught through observation of ṛtu-lakṣaṇa (seasonal characteristics): nature’s cycles—nesting, migration, gestation—become cues for human restraint, timing, and appropriate observance.
This is calendrical/ritual-auxiliary material (ācāra and kāla-nirṇaya style), not directly sarga/pratisarga/vaṃśa/manvantara/vaṃśānucarita, though Purāṇas often embed such instruction alongside them.
Birds nesting and ‘sleeping’ in season symbolize withdrawal and consolidation—an inward turn appropriate to rains—supporting the Purāṇic idea that correct practice follows the tempo of the cosmos.