Abstract
FROM time to time I have experienced, immediately upon awakening from sleep ($$ξυπν$$$$), the ability to see with illumination below the threshold for scotopic vision. This power of seeing in the dark, which is transient, is quite different from scotopic (twilight) vision: the colour red can be distinguished; and the field of vision is small. I think that the portion of the retina employed is the macula lutea, a part which is generally regarded as being night-blind. That the illumination was really below the threshold for scotopic vision is confirmed by my wife who, on at least two of the several occasions, observed that the room (which was 'blacked-out') was pitch-dark.
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DUFTON, A. Exypnopia. Nature 155, 640 (1945). https://doi.org/10.1038/155640c0
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DOI: https://doi.org/10.1038/155640c0
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