Devibhagavatapurana 1.5.5

1.5.5

sūta uvāca |
śṛṇvantu munayaḥ sarve sāvadhānāḥ samantataḥ |
caritaṃ devadevasya viṣṇoḥ paramatejasaḥ ||

Sûta said:-- O Munis! Hear all attentively the glorious deeds of the supremely energetic Visnu, the Deva of the Devas. Once on a time the eternal Deva Janârdana became tired after the terrible continuous battle for ten thousand years. After this the Lord Nârâyana seated Himself on Padmâsan (a kind of posture) in some lovely place on a level plot of ground and placing his head on the front of his bow with the bow strung and placed erect on the ground fell fast asleep. Visnu, the Lord of Ramâ, was exceedingly tired and thus he fell soon into deep sleep. At this time Indra and the other Devas, with Brahmâ and Mahesâ began a sacrifice.