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We studied, by use of a questionnaire, the prevalence of sleep problems, their distribution with age, and their relationship to the early disorders of the waking-sleeping rhythm in children coming for different reasons for pediatric or psychiatric consultation, We found a higher incidence of sleep problems and, above all, an association of several sleep problems in children with previous disorders of the waking-sleeping rhythm.
Salzarulo et al. (Thu,) studied this question.