ज्येष्ठ-कनिष्ठ-धर्मः — Duties of Elders and Juniors
Anuśāsana-parva 108
अनायुष्यं दिवा स्वप्न तथाभ्युदितशायिता । प्रगे निशामाशु तथा नैवोच्छिष्टा: स्वपन्ति वै
anāyuṣyaṃ divā svapnaḥ tathābhyuditśāyitā | prage niśām āśu tathā naivocchiṣṭāḥ svapanti vai ||
毗湿摩说道:白日睡眠,以及日出之后仍卧躺安睡,都会减损寿命。黎明之时不应睡,夜初之际亦不应睡。行止端正之人,夜间不以不净之身而眠(饭后未净身者不眠)。
भीष्म उवाच
Bhishma teaches disciplined daily conduct: avoid daytime sleep and sleeping after sunrise, do not sleep at dawn or at the start of night, and maintain bodily/ritual cleanliness—especially not sleeping at night while ‘ucchiṣṭa’ (uncleansed after eating).
In the Anushasana Parva’s instruction on dharma and proper conduct, Bhishma continues giving Yudhishthira practical ethical guidance (ācāra) about daily routines—here, specifically regulating sleep and emphasizing purity.