Imagination cannot conceive the horrors it [The Nightmare] frequently gives rise to, or language describe them in adequate terms . . . Everything horrible, disgusting or terrifying in the physical or moral world is brought before him in fearful array; he is hissed at by serpents, tortured by demons, stunned by the hollow voices and cold touch of apparitions . . . . At one moment he may have the consciousness of a malignant demon being at his side; then to shun the sight of so appalling an object, he will close his eyes, but still the fearful being makes its presence known; for its icy breath is felt diffusing itself over his visage, and he knows that he is face to face with a fiend. Then, if he looks up, he beholds horrid eyes glaring upon him, and an aspect of hell grinning at him with even more hellish malice. Or, he may have
Liddon SC. Sleep Paralysis and Hypnagogic Hallucinations: Their Relationship to the Nightmare. Arch Gen Psychiatry. 1967;17(1):88–96. doi:10.1001/archpsyc.1967.01730250090013
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