Abstract
Most published questionnaires for infant sleep problems form part of general questionnaires looking at a wider range of infant behaviours. This paper evaluates the Infant Sleep Questionnaire (ISQ), a maternal self- report questionnaire designed specifically to assess sleeping behaviour in 12–18-month-old infants. The sensitivity and specificity of the ISQ as compared to maternal sleep diary measures is reported. The use of the ISQ for clinical and research purposes is discussed.

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