Bhagavatapurana 3.8.12

3.8.12

catur-yugānāṃ ca sahasram apsu svapan svayodīritayā sva-śaktyā /
kālākhyayāsādita-karma-tantro lokān apītān dadṛśe sva-dehe //

12. For a thousand cycles of *chaturyugas* (four yugas) He slept with his intelligent power, shining as ever; and having again reached the means and materials of action through the power called Time directed by Himself for the purpose, He saw the worlds lying dormant in His body, (withdrawn into Himself).