Approximately one fifth of the non-institutionalized elderly meet the criteria for PI. Those affected present a poorer state of psychological and social well-being, although level of autonomy for conducting basic and instrumental activities does not appear to be modified by the disorder. The existence of an anxiety disorder, low life satisfaction and consumption of psychopharmaceuticals constitute variables associated with PI in the population we studied.

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Our results provide a true picture of the prevalence of insomnia in older adults on the basis of diagnostic criteria and indicate that it is a widespread, significant health problem. The peculiarities of PI, SDMD and SDMC need to be appropriately differentiated in clinical practice, and each needs a different approach to obtain the best outcome.