12/10/2023 0 Comments Conditioned insomnia definition![]() When frequency considerations were taken into account, as well as the complaint of daytime consequences, then the prevalence rates were reduced to between 6% and 18%. When no frequency/severity/chronicity criteria were specified, prevalence rates ranged from 30% to 48% of respondents. Many studies used one or more questions pertaining to symptoms of insomnia, asking respondents to indicate whether they had trouble falling asleep, staying asleep, or with early morning awakenings. One of the most important findings from this literature was that the prevalence varied considerably depending on how insomnia was defined ( Fig. These studies were comprehensively reviewed by Ohayon 5 in 2002. The prevalence of insomnia has been examined in several dozen studies. In addition, the leading theoretical perspectives on insomnia will be reviewed (with an eye towards identifying the factors that may mediate/moderate the above noted transitions) and a research agenda provided. In this review, what is known about the natural history of insomnia (in terms of prevalence, incidence, and clinical course) will be reviewed. Of the groundbreaking studies that document these phenomena, none have provided information about the factors that mediate/moderate the transitions between good sleep to acute insomnia and from acute insomnia to either recovery or chronic insomnia. These data, while essential to document the magnitude of this health problem, infrequently provide information related to the incidence of new-onset insomnia and even less frequently provide information on the incidence of spontaneous remission and relapse. Over the last several decades the prevalence and incidence of insomnia has been described in great detail. ![]() What We Know and Don’t Know (Empirical Findings) 1– 4 The present paper provides a review of these issues and sets forth a research agenda. While these studies have provided seminal information about the epidemiology of insomnia, no studies to date, have been conducted in a manner to 1) allow for a close resolution of the “transitions” from good sleep to acute insomnia, from acute insomnia to the recovery of good sleep, or from acute insomnia to chronic insomnia and/or 2) allow for a comprehensive assessment of the factors that have been theorized to mediate or moderate these transitions. To date, studies of the natural history of insomnia have focused on the prevalence, incidence, and persistence of chronic insomnia. 2The Northumbria Centre for Sleep Research, Department of Psychology, Northumbria University, Newcastle, UK Correspondence: Michael Perlis, PhD, Behavioral Sleep Medicine Program, Department of Psychiatry, University of Pennsylvania, Suite 670, 3535 Market Street, Philadelphia, PA 19104, USA, Tel +1-21, Fax +1-27, E-m31 12 2011 2 3 79 88 06 12 2011 13 12 2011 Copyright © 2011 The Korean Society of Sleep Medicine 2011
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