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On Dreams   

dream. Nor should the true thoughts, as distinct from the mere

presentations, which occur in sleep [be called dreams]. The dream

proper is a presentation based on the movement of sense impressions,

when such presentation occurs during sleep, taking sleep in the strict

sense of the term.

There are cases of persons who in their whole lives have never had a

dream, while others dream when considerably advanced in years,

having never dreamed before. The cause of their not having dreams

appears somewhat like that which operates in the case of infants, and

[that which operates] immediately after meals. It is intelligible

enough that no dream-presentation should occur to persons whose

natural constitution is such that in them copious evaporation is borne

upwards, which, when borne back downwards, causes a large quantity of

motion. But it is not surprising that, as age advances, a dream should

at length appear to them. Indeed, it is inevitable that, as a change

is wrought in them in proportion to age or emotional experience, this

reversal [from non-dreaming to dreaming] should occur also.


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