Verse 15

पावनी परमोदारा शुद्धसत्त्वानुपातिनी ।आत्मध्यानमयी नित्यं सुषुप्तस्येव तिष्ठति

In plain words

Purifying, supremely noble, following upon pure sattva, consisting in meditation on the ātman -- it abides constantly, like that of one in deep sleep.