Epidemiological survey of insomniac subjects in a sample of 1,761 outpatients

Clinical data about insomnia and its treatment were collected in a sample of 1,761 patients who had consulted general practitioners for insomnia. In this sample, we found an incidence of 53% of patients presenting some psychiatric symptoms. We also estimated that 24% of those patients suffered from a depressive disorder, confirming previous findings of the high association of insomnia with affective disorders and other psychiatric conditions.