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Fisher and his co-workers present another in their series of studies of night terrors. A central problem in this paper, also discussed in their previous work, is the question of what triggers the onset of the attacks. The work of Broughton and of Arkin is reviewed. The former investigator felt that Stage 4 night terrors develop as part of an 'arousal response' of exaggerated physiological events and are only indirectly related to Stage 4 mental activity. Arkin and his co-workers found an appreciable degree of recall of NREM content in terrors or related phenomena. The night terror is not a dream in the ordinary sense, but rather a severe symptom arising out of Stage 4. It appears to resemble an acute, brief but reversible paranoid episode. In this study, the most frequent theme when recall occurred was fear of aggression by a person or persons. Fisher and his group found a mean of fifty-eight per cent recall of mental content from night terrors. They feel that their data argue for ongoing mental content which may be instrumental in triggering the night terror. Since night terrors may be elicited artificially by sounding a buzzer, however, it is concluded that mental activity need not be the only precipitating factor. The tentative hypothesis, therefore, includes the possibility of both exogenous and endogenous triggering factors.