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Schizophrenia Research and Treatment
Volume 2013 (2013), Article ID 425826, 7 pages
http://dx.doi.org/10.1155/2013/425826
Research Article

Sleep, Fatigue, and Functional Health in Psychotic Patients

1School of Psychiatry and Clinical Neurosciences, The University of Western Australia, Perth, WA 6009, Australia
2Clinical Research Centre, Graylands Hospital, North Metropolitan Mental Health, Private Bag No. 1, Claremont Perth, WA 6910, Australia
3Clinical Applications Unit, Graylands Hospital, North Metropolitan Mental Health, Perth, WA 6910, Australia

Received 9 March 2013; Accepted 10 April 2013

Academic Editor: Markus Jäger

Copyright © 2013 Flavie Waters et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study sought to examine the association between sleep, fatigue, and functional health in psychotic patients. Participants included 93 psychotic inpatients ( with schizophrenia) who completed the Chalder Fatigue Scale (ChFS), the Fatigue Symptom Inventory (FSI), the Pittsburgh Sleep Quality Index (PSQI), and the SF36 Health Survey. Patients were classified on the basis of their performance on sleep and fatigue measures: 60% reported significant levels of fatigue and 67% significant sleep disturbances. 28.4% reported both, suggesting that fatigue and sleep dysfunctions do not necessarily cooccur. A closer examination of patterns showed that fatigue was only related to qualitative aspects of sleep and not quantifiable aspects of sleep disturbances. The results also showed that functional health was the lowest in patients with high levels of fatigue, compared to patients with sleep problems only or patients with neither symptom. A regression analysis further showed that the size of the contribution of fatigue onto functional health was twice as much as that of sleep dysfunctions. In conclusion, the results show that (i) dissatisfaction with sleep—and not sleep itself—is related to fatigue symptoms and that (ii) fatigue is particularly detrimental to functional health, regardless of the presence of sleep dysfunctions.