। ॥ ५८६ ॥
In plain words
In deep sleep, the intellect and all mental faculties dissolve into their causal matrix—the unmanifest—remaining dormant in their own potential, just as a giant banyan tree rests entirely unmanifest within its tiny seed.
Close to the Sanskrit
The intellect and all else, in deep sleep, are dissolved in their own cause, in the unmanifest, like a banyan tree in its seed, existing in an unmodified nature.