Among the dreams mentioned in earlier sections there were already several which could serve as examples of processing nervous stimuli, as they are called. The dream of drinking water in great draughts is one of these; in this case the somatic stimulus is apparently the sole source of the dream, and the wish deriving from the sensation--thirst--its only motive. It is similar in other simple dreams, if the somatic stimulus by itself is capable of creating a wish. The dream of the invalid who cast the cooling appliance off her cheek at night shows an unusual way of reacting to painful stimuli with a wish-fulfillment. It seems that the invalid had temporarily contrived to numb her own sensations, and in doing so she foisted her pain on someone else.
from pp 179-180 of The Interpretation of Dreams by Sigmund Freud. Joyce Crick, trans. Oxford University Press, 1999 (1899)