Shiva Purana
प्रारब्धचण्डनृत्येषु ततः प्रलयवारिषु ॥ ब्रह्मा नारायणो भूत्वा सुष्वाप सलिले सुखम् ॥ १३ ॥
Then, as the fierce dances began, the waters of annihilation began. Brahma assumed the form of Narayana and fell asleep happily in the water.
english translation
prArabdhacaNDanRtyeSu tataH pralayavAriSu ॥ brahmA nArAyaNo bhUtvA suSvApa salile sukham ॥ 13 ॥
hk transliteration by Sanscript