Vishnupurana 6.4.7

6.4.7

eṣa naimittiko nāma maitreya pratisaṃcaraḥ
nimittaṃ tatra yac chete brahmarūpadharo hariḥ //

WHEN the waters have reached the region of the seven Rishis, and the whole of the three worlds is one ocean, they stop. The breath of Vishńu becomes a strong wind, which blows for more than a hundred years, until all the clouds are dispersed. The wind is then reabsorbed, and he of whom all things are made, the lord by whom all things exist, he who is inconceivable, without beginning of the universe, reposes, sleeping upon Śesha, in the midst of the deep. The creator, Hari, sleeps upon the ocean, in the form of Brahmá--glorified by Sanaka And the saints who had gone to the Janaloka, and contemplated by the holy inhabitants of Brahmaloka, anxious for final liberation--involved in mystic slumber, the celestial personification of his own illusions, and meditating on his own ineffable spirit, which is called Vásudeva. This, Maitreya, is the dissolution termed incidental, because Hari, in the form of Brahmá, sleeps there, as its incidental cause.