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Purpose: The purpose of this study was to identify factors influencing functional health of patients with chronic insomnia based on the Theory of Unpleasant Symptoms (TOUS). Methods: Data were collected from 184 patients with chronic insomnia who had been treated at the sleep center in hospital in South Korea. Data were collected from 23 December 2014 to 18 May 2015 through self-reported questionnaires from pre-sleep arousal, worry, perceived stress, social support, insomnia symptom, anddoi:10.7475/kjan.2019.31.2.165 fatcat:agemlhfkknffneui7czeczoko4