Śrī Brahma-saṁhitā 5.12

nārāyaṇaḥ sa bhagavān
āpas tasmāt sanātanāt
āvirāsīt kāraṇārṇo
nidhiḥ saṅkarṣaṇātmakaḥ
yoga-nidrāṁ gatas tasmin
sahasrāṁśaḥ svayaṁ mahān

Synonyms

nārāyaṇaḥnamed Nārāyaṇa; saḥthat; bhagavānSupreme Personality of Godhead, Mahā-Viṣṇu; āpaḥwater; tasmātfrom that; sanātanāteternal person; āvirāsīthas sprung; kāraṇa-arṇaḥthe Causal Ocean; nidhiḥexpanse of water; saṅkarṣaṇa-ātmakaḥthe subjective portion of Saṅkarṣaṇa; yoga-nidrām gataḥin the state of deep sleep; tasminin that (water); sahasra-aṁśaḥwith thousands of portions; svayamHimself; mahānthe Supreme Person.

Translation

The same Mahā-Viṣṇu is spoken of by the name of "Nārāyaṇa" in this mundane world. From that eternal person has sprung the vast expanse of water of the spiritual Causal Ocean. The subjective portion of Saṅkarṣaṇa who abides in paravyoma, the above supreme puruṣa with thousands of subjective portions, reposes in the state of divine sleep [yoga-nidrā] in the waters of the spiritual Causal Ocean.

Purport

Yoga-nidrā (divine sleep) is spoken of as ecstatic trance which is of the nature of the bliss of the true subjective personality. The above-mentioned Ramādevī is yoga-nidrā in the form of Yogamāyā.