SB 3.9.20
yo ’vidyayanupahato ’pi dasardha-vrttya
nidram uvaha jathari-krta-loka-yatrah
antar-jale ’hi-kasipu-sparsanukulam
bhimormi-malini janasya sukham vivrnvan
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
My Lord, You accept the pleasure of sleeping in the water of devastation, where there are violent waves, and You enjoy pleasure on the bed of snakes, showing the happiness of Your sleep to intelligent persons. At that time, all the universal planets are stationed within Your abdomen.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Persons who cannot think of anything beyond the limit of their own power are like frogs in a well who cannot imagine the length and breadth of the great Pacific Ocean. Such people take it as legendary when they hear that the Supreme Lord is lying on His bed within the great ocean of the universe. They are surprised that one can lie down within water and sleep very happily. But a little intelligence can mitigate this foolish astonishment. There are many living entities within the bed of the ocean who also enjoy the material bodily activities of eating, sleeping, defending and mating. If such insignificant living entities can enjoy life within the water, why can’t the Supreme Lord, who is all-powerful, sleep on the cool body of a serpent and enjoy in the turmoil of violent ocean waves? The distinction of the Lord is that His activities are all transcendental, and He is able to do anything and everything without being deterred by limitations of time and space. He can enjoy His transcendental happiness regardless of material considerations.