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Although it is increasingly recognized that cancer patients often have sleep problems, we lack data on their prevalence and associations in representative clinical populations. We aimed to determine (i) the prevalence of sleep problems amongst outpatients of a cancer centre and (ii) the association with medical variables, emotional distress and pain.

Secondary analysis of self‐report and medical data on 2862 cancer centre outpatients. Sleep problems were identified using the sleep item from the Patient Health Questionnaire‐9: ‘Over the last two weeks, how often have you been bothered by trouble falling or staying asleep or sleeping too much?’ scored on a four‐point frequency scale. Emotional distress was measured using the Hospital Anxiety and Depression Scale and pain using the subscale of the European Organisation for Research and Treatment of Cancer Quality of Life Core 30 …