A month of human beings is equal to a day and night of the departed manes. That division consists in this: the light half of the month is their day which is for work; and the dark fortnight is their night for sleep.
पित्र्ये रात्र्यहनी मास: प्रविभागस्तयोः पुनः। शुक्लोऽहं कर्मचेष्टायां कृष्णः स्वप्नाय शर्वरी॥