Matsya Purana — Tripura’s Prosperity
दधिसक्तून्पयश्चैव कपित्थानि च रात्रिषु भक्षयन्ति च शेरन्त उच्छिष्टाः संवृतास्तथा //
dadhisaktūnpayaścaiva kapitthāni ca rātriṣu bhakṣayanti ca śeranta ucchiṣṭāḥ saṃvṛtāstathā //
At night they eat curds mixed with parched grain (saktu), and drink milk, and eat wood-apples (kapittha); and they lie down to sleep while still in a state of ucchiṣṭa—impurity from leftover food—remaining covered in that condition.
This verse is not about Pralaya; it focuses on everyday dharmic conduct—specifically food habits and the impurity of remaining ucchiṣṭa (uncleansed after eating).
It underscores household and social discipline: one should avoid night-time eating habits that lead to negligence of cleanliness, and one should not sleep while still ucchiṣṭa—implying the duty to maintain śauca (purity) and regulated routine.
No Vāstu or temple-architecture rule is stated; the ritual takeaway is śauca—avoid remaining in an ucchiṣṭa state (leftover impurity) and cleanse appropriately before resting.