In this work a hipotetical relationship has settled down among emotion, Narcolepsy and Conscience. For it, two of the symptoms of this syndrome have been selected, day excessive drowsiness and cataplexy. This way, and after a detailed analysis of both symptoms, we coincide in pointing toward the importance that have the emotion, the anomalies of the dream REM found in subjects with narcolepsy and the conscious in the dysfunction that occupies us. For it, and to relate the narcolepsy with the conscience and the emotion, we have worked on the theory of the Emotion of Mandler, the theory of Activity of Search on the functions of the dream REM of Rottenberg and that of William James. The final result of this work has been a speculation of the processes that happen in the subjects with narcolepsy abiding to the previously noted theories.