We generally consider the flow of saliva as a sign of appetite. But in this patient, whose mouth zone was so markedly in the service of his sexuality, such a flow was an accompanying symptom of a sexual excitement occurring during sleep.
Abraham advances the central psychoanalytic claim that in patients with intense oral fixation, salivation functions as a libidinal discharge rather than a nutritive signal, constituting the oral equivalent of nocturnal emission.
, Selected Papers on Psychoanalysis, 1927thesis