Lastly, that I may comprehend the opinion of the ancient theologists, on the state of the soul after death, in a few words: they considered, as we have elsewhere asserted, things divine as the only realities, and that all others were only the images and shadows of truth. Hence they asserted that prudent men, who earnestly employed themselves in divine concerns, were above all others in a vigilant state. But that imprudent [i. e. without foresight] men, who pursued objects of a different nature, being laid asleep, as it were, were only engaged in the delusions of dreams; and that if they happened to die in this sleep, before they were roused, they would be afflicted with similar and still more dazzling visions in a future state. And that as he who in this life pursued realities, would, after death, enjoy the highest truth, so he who pursued deceptions would hereafter be tormented with fallacies and delusions in the extreme: as the one would be delighted with true objects of enjoyment, so the other would be tormented with delusive semblances of reality. Ficinus
Narcissus
As Narcissus, by catching at the shadow, plunged himself in the stream and disappeared, so he who is captivated by beautiful bodies, and does not depart from their embrace, is precipitated, not with his body, but with his soul, into a darkness profound and repugnant to intellect (the higher soul), through which, remaining blind both here and in Hades, he associates with shadows. Plotinus
The Soul Descends into Generation
When the soul has descended into generation (from its first divine condition) she partakes of evil, and is carried a great way into a state the opposite of her first purity and integrity, to be entirely merged in which, is nothing more than to fall into dark mire.
…
The soul therefore dies as much as it is possible for the soul to die :and the death to her is while baptized or immersed in the present body, to descend into matter, and be wholly subjected by it; and after departing thence to lie there till it shall arise and turn its face away from the abhorrent filth. This is what is meant by the falling asleep in Hades, of those who have come there.
Γινομενῳ δε ἡ μεταληψις αυτου. Γιψνεται γαρ πανταπασιν εν τῳ της ανομοιοτητος τοπῳ, ενϑα δυς εις αυτην εις βορβορον σκοτεινον εσται πεσων.—Αποϑνησκει ουν, ως ψυχη αν ϑανοι· και ὁ ϑανατος αυτῃ, και ετι εν τω σωματι βεβαπτισμενη, εν ὑλῃ εστι καταδυναι, και πλησϑηναι αυτης. Και εξελϑουσης εκει κεισϑαι, εως αναδραμῃ και αφελῃ πως την οψιν εκ του βορβορου. Και τουτο εστι το εν ᾁδου ελϑοντα επικατα δαρϑειν.
Plotinus, Ennead I book viii
The Soul is Imprisoned in the Body
Whatever we see when awake is death; and when asleep, a dream. – Pythagoras
θανατος εστιν, οκοσα εγερϑεντες ορεομεν· οκοσα δε ευδοντες, ὑπνος.