title: Associations of reported bruxism with insomnia and insufficient sleep symptoms among media personnel with or without irregular shift work.
abstract: BACKGROUND
  The aims were to investigate the prevalence of perceived sleep quality and insufficient sleep complaints, and to analyze whether self-reported bruxism was associated with perceptions of sleep, and awake consequences of disturbed sleep, while controlling confounding factors relative to poor sleep.
  
  
  METHODS
  A standardized questionnaire was mailed to all employees of the Finnish Broadcasting Company with irregular shift work (n = 750) and to an equal number of randomly selected controls in the same company with regular eight-hour daytime work.
  
  
  RESULTS
  The response rate in the irregular shift work group was 82.3% (56.6% men) and in the regular daytime work group 34.3% (46.7% men). Self-reported bruxism occurred frequently (often or continually) in 10.6% of all subjects. Altogether 16.8% reported difficulties initiating sleep (DIS), 43.6% disrupted sleep (DS), and 10.3% early morning awakenings (EMA). The corresponding figures for non-restorative sleep (NRS), tiredness, and sleep deprivation (SLD) were 36.2%, 26.1%, and 23.7%, respectively. According to logistic regression, female gender was a significant independent factor for all insomnia symptoms, and older age for DS and EMA. Frequent bruxism was significantly associated with DIS (p = 0.019) and DS (p = 0.021). Dissatisfaction with current work shift schedule and frequent bruxism were both significant independent factors for all variables describing insufficient sleep consequences.
  
  
  CONCLUSIONS
  Self-reported bruxism may indicate sleep problems and their adherent awake consequences in non-patient populations.
authors.affiliation: Institute of Dentistry, University of Helsinki, Helsinki, Finland. kristiina.ahlberg@helsinki.fi
authors.forename: Kristiina
authors.initials: K
authors.lastname: Ahlberg
authors.forename: Antti
authors.initials: A
authors.lastname: Jahkola
authors.forename: Aslak
authors.initials: A
authors.lastname: Savolainen
authors.forename: Mauno
authors.initials: M
authors.lastname: Könönen
authors.forename: Markku
authors.initials: M
authors.lastname: Partinen
authors.forename: Christer
authors.initials: C
authors.lastname: Hublin
authors.forename: Juha
authors.initials: J
authors.lastname: Sinisalo
authors.forename: Harri
authors.initials: H
authors.lastname: Lindholm
authors.forename: Seppo
authors.initials: S
authors.lastname: Sarna
authors.forename: Jari
authors.initials: J
authors.lastname: Ahlberg
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D005387:Finland; D006306:Health Surveys; D006801:Humans; D008297:Male; D008402:Mass Media; D008875:Middle Aged; D015995:Prevalence; D020186:Sleep Bruxism / Q000150:complications*; D020178:Sleep Disorders, Circadian Rhythm / Q000453:epidemiology*; D007319:Sleep Initiation and Maintenance Disorders / Q000453:epidemiology*