Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 4
Sanskrit:
एष नैमित्तिक: प्रोक्त: प्रलयो यत्र विश्वसृक् ।शेतेऽनन्तासनो विश्वमात्मसात्कृत्य चात्मभू: ॥ ४ ॥
ITRANS:
eṣa naimittikaḥ proktaḥpralayo yatra viśva-sṛkśete ’nantāsano viśvamātmasāt-kṛtya cātma-bhūḥ
Translation:
This is called the naimittika, or occasional, annihilation, during which the original creator, Lord Nārāyaṇa, lies down upon the bed of Ananta Śeṣa and absorbs the entire universe within Himself while Lord Brahmā sleeps.