Matsya Purana — The Madana-Dvādaśī Vow and the Birth of the Maruts
निद्राभरसमाक्रान्ता दिवापरशिराः क्वचित् ततस्तदन्तरं लब्ध्वा प्रविष्टस्तु शचीपतिः //
nidrābharasamākrāntā divāparaśirāḥ kvacit tatastadantaraṃ labdhvā praviṣṭastu śacīpatiḥ //
Overcome by the heaviness of sleep, and at times resting her head even in the daytime, she grew inattentive; then Śacī’s lord (Indra), finding that interval of opportunity, entered.
This verse itself does not describe Pralaya; it is a narrative moment emphasizing opportunity and human (or divine) misconduct, which the Purana often uses as moral contrast alongside larger cosmic teachings.
It underscores the importance of alertness, self-restraint, and guarding against impropriety—virtues expected of householders and especially rulers, who must avoid acting from opportunism or desire.
No Vastu or ritual procedure is specified in this verse; its significance is primarily ethical and narrative rather than architectural.