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Sleep disturbances are frequent in Angelman syndrome (AS); however, beside the few studies which have investigated sleep disorders in AS by means of questionnaires, to our knowledge, no systematic polysomnographic recordings have been carried out in AS patients. The present study represents the first attempt to study sleep patterns of AS by polysomnography, to evaluate the influences of sleep on the paroxysmal electroencephalogram (EEG) patterns of AS and to assess the eventual age-related changes of sleep architecture and of sleep EEG abnormalities in children and adolescents with AS.

Fifteen children with AS (7 males and 8 females, mean age 7.2 years, range 3–16 years), attending the Sleep Center of the Department of Child Neurology and Psychiatry of the University of Rome ‘La Sapienza’ and the Sleep Research Centre of the Oasi Institute (IRCCS) of Troina were included …