SB 3.8.23
mrnala-gaurayata-sesa-bhoga-
paryanka ekam purusam sayanam
phanatapatrayuta-murdha-ratna-
dyubhir hata-dhvanta-yuganta-toye
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Brahma could see that on the water there was a gigantic lotuslike white bedstead, the body of Sesa-naga, on which the Personality of Godhead was lying alone. The whole atmosphere was illuminated by the rays of the jewels bedecking the hood of Sesa-naga, and that illumination dissipated all the darkness of those regions.