title: More years, less yawns: fresh evidence on tiredness by age and other factors.
abstract: OBJECTIVE
  It is commonplace for people to complain about being tired. There have been actually few studies of tiredness in large general population samples, and where studies do exist, the measures often rely on external assessments. We use a diary-based method to overcome these limitations in a representative sample of U.S. residents.
  
  
  METHODS
  Data come from the 2010 American Time Use Survey. Around 13,000 respondents provided a diary about the prior day and rated how tired they felt during selected activities. Regression analysis is used to explain variance in tiredness by age.
  
  
  RESULTS
  Regression analysis reveals that tiredness decreases with age. This relationship exists when we control for hours of sleep, gender, self-rated health, ethnic group, number of children, marital status, employment status, level of education, and the amount of time participants spent doing tiring activities.
  
  
  CONCLUSIONS
  Contrary to much previous research, tiredness decreases with age. People who are more than 65 years of age are almost one point on a 0-6 scale less tired than people aged between 15 and 24. Clinical implications and methodological limitations are discussed.
authors.affiliation: Department of Social Policy, London School of Economics and Political Science, London, UK.
authors.forename: Paul
authors.initials: P
authors.lastname: Dolan
authors.affiliation: Department of Social Policy, London School of Economics and Political Science, London, UK. l.kudrna@lse.ac.uk.
authors.forename: Laura
authors.initials: L
authors.lastname: Kudrna
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D000375:Aging / Q000502:physiology*; D005221:Fatigue / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014481:United States / Q000453:epidemiology; D055815:Young Adult
keywords: Age; Diary; Fatigue; Tiredness