Within the depth-psychology corpus, Ephialtes functions primarily as the philological and mythological anchor for the nightmare demon—a figure whose very name encodes the phenomenology of nocturnal oppression. Roscher's monograph, translated and introduced by Hillman in Pan and the Nightmare, furnishes the most sustained treatment: Ephialtes (alongside the variant Epialtes) designates the crushing, leaping daemon who assails the sleeper, etymologically traceable to either iallein ('to send,' 'to shoot') or hallomai ('to leap'), with Roscher preferring the latter as phenomenologically more precise. The figure is not merely a linguistic curiosity but a psychic reality at the intersection of fever, erotic disturbance, respiratory crisis, and mythological imagination. Critically, Roscher documents the daemon's convergence with Typhos, with Pan, with incubi, and with Hypnos—demonstrating the nightmare's embeddedness in a polytheistic field of overlapping daemonic agencies. In the Homeric genealogical tradition, Ephialtes also names one of the Aloadae, the giant sons of Aloeus, whose stepmother Eeriboea appears in the Iliad; this heroic-gigantomachic Ephialtes coexists uneasily with the daemonic nocturnal figure. Rohde situates Pan-as-Ephialtes within the broader economy of Greek demonology, linking nightmare to heroic cult, pollution, and the agency of daemones. The corpus thus treats Ephialtes as a nodal term: lexical, demonological, genealogical, and depth-psychological simultaneously.
In the library
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the two most widely known words for the nightmare are epialtes and ephialtes… the ancient and the modern scholars vacillate between the derivations iallo ('I send,' 'I shoot') and hallomai. Phonetically both derivatives seem equally valid, but for content hallesthai is to be preferred
Roscher establishes the core philological debate over the etymology of Ephialtes, arguing on phenomenological grounds for the derivation from hallomai ('to leap') as the more content-appropriate root for the nightmare daemon.
Hillman, James; Roscher, Wilhelm Heinrich, Pan and the Nightmare, 1972thesis
the demon of typhoid fever (tuphos, tuphomanie, tuphodes puretos)… also seems to have been identified or confused with the nightmare demon Ephialtes. (The sensuous dreams are probably connected with the emissions of semen, which Hippocrates had already observed in certain forms of typhoid.)
Roscher traces the daemonic convergence of Ephialtes with Typhos and fever-demonology, linking the nightmare figure to erotic dreams, seminal emission, and delirium in ancient medical and mythological thought.
Hillman, James; Roscher, Wilhelm Heinrich, Pan and the Nightmare, 1972thesis
like Pan as Ephialtes: Didym. ap. Sch. Ar., Ves. 1038… The Lamiai and Empousai seem also to have been night-terrors… of Pan-Ephialtes, ἐὰν δέ συνουσιάζῃ, Artemid.
Rohde documents the ancient equation of Pan with Ephialtes as nightmare daemon, situating him within a cluster of nocturnal terrors—Lamiai, Empousai—all capable of erotic assault, as attested by Artemidorus.
Rohde, Erwin, Psyche: The Cult of Souls and the Belief in Immortality among the Greeks, 1894thesis
The translation of 'Ephialtes' is published under license from B. G. Teubner Verlag… The translation of 'Ephialtes' was made by A.V. O'Brien in Vienna in 1963–64
The publication history of Pan and the Nightmare identifies Roscher's 'Ephialtes' as the foundational text translated for depth-psychological circulation, establishing its scholarly provenance and editorial lineage.
Hillman, James; Roscher, Wilhelm Heinrich, Pan and the Nightmare, 1972supporting
The Iliad's glossary places Ephialtes in the Homeric genealogical tradition as one of the Aloadae, giant sons of Aloeus, distinguishing the heroic-mythological figure from the daemonic nightmare entity.
Lattimore, Richmond, The Iliad of Homer, 2011supporting
Eeriboea (e-er'-i-boy-a): Stepmother of Otus and Ephialtes. 5.522.
The Iliad names Ephialtes as one of the Aloadae with a human stepmother, anchoring the figure within the epic's heroic catalogue and the giants' rebellion against the Olympians.
Alo'eus: Husband of Iphimedeia, putative father of Otos and Ephialtes, xi.305.
The Odyssey's index records the parentage of Ephialtes through Iphimedeia and the nominal father Aloeus, while the 'putative' qualification signals awareness of the divine conception tradition.
Lattimore, Richmond, Odyssey of Homer, 2009supporting
Imphimedei'a: Mother of Otos and Ephialtes, xi.305.
The Odyssey glossary identifies Iphimedeia as the mother of Ephialtes and Otos, establishing the Aloadae's matrilineal genealogy within the Homeric underworld narrative.
Lattimore, Richmond, Odyssey of Homer, 2009supporting
'Hεpίβoια: Eriboea, the second wife of Aloeus, step-mother of Otus and Ephialtes, E 389.
The Homeric Dictionary entry for Eriboea confirms the Iliad's placement of Ephialtes within the Aloadae family structure, providing the lexical reference point for his epic identity.
in Polish and modern Greek, mora signifies the nightmare demon… the fact that the fauns or pilosi answer questions put to them shows that they are genuine nightmare demons. Obviously, the term pilosi specifies the nightmare demon as a rough-haired, shaggy being.
Roscher's comparative ethnography situates the nightmare daemon—cognate with Ephialtes—within a cross-cultural field of rough-haired, goat-shaped incubi, linking the Greek figure to Slavic, Latin, and Gallic parallels.
Hillman, James; Roscher, Wilhelm Heinrich, Pan and the Nightmare, 1972supporting
a large number of people are attacked at the same time by the nightmare – just as in an epidemic – and that these people all have the same visions… chased by panicky terror, ran out into the open. (Note here the close link between the nightmare and the panicky terror of man and animals.)
Roscher documents collective nightmare apparitions that demonstrate the structural continuity between Ephialtes as personal nocturnal demon and Pan as the agent of mass panic, both expressions of the same daemonic archetype.
Hillman, James; Roscher, Wilhelm Heinrich, Pan and the Nightmare, 1972supporting