title: Association of daytime sleepiness and the morningness/eveningness dimension in young adult subjects in Brazil.
abstract: Sleepiness is a major public health problem associated with motor vehicle crashes, occupational accidents, decreased productivity, and interpersonal problems. It can be influenced by many factors, including the individual's circadian rhythm. The objective of this study is to assess the correlation between the morningness/eveningness dimension and daytime sleepiness in medical school students. This is a cross-sectional study; 310 subjects (123 women and 187 men, M age 20.5 +/- 1.9 yr.) completed a questionnaire on use of drugs, diagnostic diseases, sleeping habits, the Morningness/Eveningness Questionnaire and the Epworth Sleepiness Scale. The only variable related to daytime sleepiness was the morningness/eveningness dimension (r = -.18, p=.002). Questions with higher coefficients of discrimination between the morning and the evening chronotype were "Lying down to rest in the afternoon when circumstances permit" (.61), "Sitting and reading" (.53), and "As a passenger in a car for an hour without a break" (.53). The implications of the findings are discussed.
authors.affiliation: Psychiatry Service, Hospital Presidente Vargas, Porto Alegre, RS, Brazil. mpaz@cpovo.net
authors.forename: Maria Paz Loayza
authors.initials: MP
authors.lastname: Hidalgo
authors.forename: Camila Morelatto
authors.initials: CM
authors.lastname: de Souza
authors.forename: Camila Bressan
authors.initials: CB
authors.lastname: Zanette
authors.forename: Paula Vianna
authors.initials: PV
authors.lastname: Nunes
mesh_terms: D000063:Accidents, Traffic / Q000706:statistics & numerical data; D000328:Adult; D001938:Brazil; D002940:Circadian Rhythm; D003430:Cross-Sectional Studies; D006970:Disorders of Excessive Somnolence / Q000208:ethnology*; D005260:Female; D006801:Humans; D008297:Male; D011795:Surveys and Questionnaires