title: A Population-Based Study on Nighttime Road Traffic Noise and Insomnia.
abstract: The aims of the present study were to investigate how nighttime road traffic noise relates to self-reported symptoms of insomnia and sleep medication use.
  
  
  
  We used questionnaire data from the population-based study Health and Environment in Oslo (HELMILO) (2009-2010; n = 13019). The insomnia symptoms difficulties falling asleep, awakenings during the night, and waking up too early in the morning as well as self-reported sleep medication use were included as outcomes. Modeled noise levels (Lnight) were assigned to each participant's home address. For selecting covariates to the statistical model, we used a directed acyclic graph. The associations between noise and sleep were analyzed using logistic regression models.
  
  
  
  After adjustment for potential confounders, we found an odds ratio (OR) of 1.05 (95% confidence interval [CI]: 1.01-1.09) for the association between traffic noise and difficulties falling asleep, in the total study population. For the association between traffic noise and awakenings during the night, the OR was 1.04 (95% CI: 1.00-1.08) and for waking up too early, the OR was 1.06 (95% CI: 1.02-1.11). The effect estimates are given per 5-dB increase in traffic noise level (Lnight). Self-reported sleep medication use was not statistically significantly associated with traffic noise exposure.
  
  
  
  In an adult population from Oslo, traffic noise was associated with difficulties falling asleep and waking up too early. These findings indicate that sleep quantity may be compromised for individuals living in areas highly exposed to nighttime traffic noise.
authors.affiliation: Domain for Infection Control and Environmental Health, Department of Air Pollution and Noise, Norwegian Institute of Public Health,Oslo, Norway.
authors.forename: Jorunn
authors.initials: J
authors.lastname: Evandt
authors.affiliation: Domain for Infection Control and Environmental Health, Department of Air Pollution and Noise, Norwegian Institute of Public Health,Oslo, Norway.
authors.forename: Bente
authors.initials: B
authors.lastname: Oftedal
authors.affiliation: Domain for Infection Control and Environmental Health, Department of Air Pollution and Noise, Norwegian Institute of Public Health,Oslo, Norway.
authors.forename: Norun
authors.initials: N
authors.lastname: Hjertager Krog
authors.affiliation: Department of Community Medicine, University of Oslo, Oslo, Norway.|Domain for Mental and Physical Health, Department of Noncommunicable Diseases, Norwegian Institute of Public Health, Oslo, Norway.
authors.forename: Per
authors.initials: P
authors.lastname: Nafstad
authors.affiliation: Domain for Infection Control and Environmental Health, Department of Air Pollution and Noise, Norwegian Institute of Public Health,Oslo, Norway.
authors.forename: Per E
authors.initials: PE
authors.lastname: Schwarze
authors.affiliation: Domain for Infection Control and Environmental Health, Department of Air Pollution and Noise, Norwegian Institute of Public Health,Oslo, Norway.
authors.forename: Gunn
authors.initials: G
authors.lastname: Marit Aasvang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003624:Darkness; D004777:Environment; D005260:Female; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009624:Noise, Transportation / Q000009:adverse effects*; D009664:Norway; D016017:Odds Ratio; D057566:Self Report; D012890:Sleep; D000068776:Sleep Aids, Pharmaceutical / Q000627:therapeutic use; D007319:Sleep Initiation and Maintenance Disorders / Q000188:drug therapy / Q000209:etiology*; D011795:Surveys and Questionnaires
chemical_list: D006993:Hypnotics and Sedatives; D000068776:Sleep Aids, Pharmaceutical
keywords: directed acyclic graph; environmental epidemiology; insomnia; population-based study; sleep disturbance; sleep medication use; traffic noise