kalena-because of time (the end of Brahma's day); agata-nidrasya-when he felt sleepy; dhatuh-of Brahma; sisayisoh-desiring to lie down to sleep; bali-very powerful; mukhatah-from the mouth; nihsrtan-emanating; vedan-the Vedic knowledge; hayagrivah-the great demon named Hayagriva; antike-nearby; aharat-stole.