When the three worlds were submerged in water, Visnu was alone, lying on His bedstead, although He appeared to be in slumber in His own internal potency, free from the action of the external energy, His eyes were not completely closed

Expressions researched:
"At that time when the three worlds were submerged in water, Garbhodakaśāyī Viṣṇu was alone, lying on His bedstead, the great snake Ananta, and although He appeared to be in slumber in His own internal potency, free from the action of the external energy, His eyes were not completely closed"

Srimad-Bhagavatam

SB Canto 3

At that time when the three worlds were submerged in water, Garbhodakaśāyī Viṣṇu was alone, lying on His bedstead, the great snake Ananta, and although He appeared to be in slumber in His own internal potency, free from the action of the external energy, His eyes were not completely closed.

SB 3.8.10, Translation and Purport

At that time when the three worlds were submerged in water, Garbhodakaśāyī Viṣṇu was alone, lying on His bedstead, the great snake Ananta, and although He appeared to be in slumber in His own internal potency, free from the action of the external energy, His eyes were not completely closed.

The Lord is eternally enjoying transcendental bliss by His internal potency, whereas the external potency is suspended during the time of the dissolution of the cosmic manifestation.