One verse

Srimad Bhagavatam 12.4.4

12.4.4

एष नैमित्तिक: प्रोक्त: प्रलयो यत्र विश्वसृक् । शेतेऽनन्तासनो विश्वमात्मसात्कृत्य चात्मभू: ॥ ४ ॥

eṣa naimittikaḥ proktaḥ pralayo yatra viśva-sṛk śete ’nantāsano viśvam ātmasāt-kṛtya cātma-bhūḥ

eṣaḥ
this
naimittikaḥ
occasional
proktaḥ
is said
pralayaḥ
annihilation
yatra
in which
viśva-sṛk
the creator of the universe, the Supreme Lord, Nārāyaṇa
śete
lies down
ananta-āsanaḥ
upon the snake-bed of Ananta Śeṣa
viśvam
the universe
ātma-sāt-kṛtya
absorbing within Himself
ca
also
ātma-bhūḥ
Lord Brahmā

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.