आचारप्रशंसा
Praise of Ācāra as the Basis of Longevity, Fame, and Prosperity
संध्यायां न स्वपेद् राजन् विद्यां न च समाचरेत्
saṁdhyāyāṁ na svaped rājan vidyāṁ na ca samācaret
பீஷ்மர் கூறினார்— அரசே! சந்தியைக்காலத்தில் உறங்கக் கூடாது; அந்நேரத்தில் கல்வியைப் படிப்பதோ பயிற்றுவதோ கூடாது.
भीष्म उवाच
Twilight (sandhyā) is treated as a liminal, disciplined time meant for prescribed observances; therefore one should avoid sleeping then and also avoid taking up study/learning activities at that junction.
In the Anuśāsana Parva’s instruction section, Bhīṣma continues advising the king (Yudhiṣṭhira) on proper conduct (ācāra), giving a specific rule about what should not be done during sandhyā-time.