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To conclude, in addition to the subjective assessment of the quality of sleep, the questionnaire studied shows the importance of dreams and of the periods of being awake that follow them.It also gives an estimation of sleep efficiency.These results concern healthy subjects.It would be interesting to extend this approach to a popula tion of subjects presenting sleep disorders so as to estab lish whether the domain explored by the questionnaire is any different.If it were, then it would be important to establish the presence of a pattern specific for each type of disorder.