ईश्वरस्येयं समष्टिरखिलकारणत्वात्कारणशरीरमानन्दप्रचुरत्वा
त्कोशवदाच्छादकत्वाच्चानन्दमयकोशः सर्वोपरमत्वा
त्सुषुप्तिरत एव स्थूलसूक्ष्मप्रपञ्चलयस्थानमिति च उच्यते
In plain words
For Īśvara this aggregate is called the Kāraṇa-śarīra because it is the cause of all; the Ānandamaya-kośa because it abounds in bliss and conceals like a sheath; and Suṣupti because everything ceases there. It is therefore the place where the gross and subtle Prapañca dissolves.