title: Daytime napping, nighttime sleeping, and Parkinson disease.
abstract: Preliminary evidence suggests that daytime sleepiness may predate clinical diagnosis of Parkinson disease. The authors examined daytime napping and nighttime sleeping durations, reported in 1996-1997 by 220,934 US NIH-AARP Diet and Health Study participants, in relation to Parkinson disease diagnoses at 3 clinical stages: established (cases diagnosed before 1995, n = 267), recent (1995-1999, n = 396), and prediagnostic (2000 and after, n = 770). Odds ratios and 95% confidence intervals were derived from multivariate logistic regression models. Longer daytime napping was associated with higher odds of Parkinson disease at all 3 clinical stages: the odds ratios comparing long nappers (>1 hour/day) with nonnappers were 3.9 (95% confidence interval: 2.8, 5.6) for established cases, 2.2 (95% confidence interval: 1.7, 3.0) for recent cases, and 1.5 (95% confidence interval: 1.2, 1.9) for prediagnostic cases. Further control for health status or nighttime sleeping duration attenuated the association for established cases but made little difference for recent or prediagnostic cases. In the nighttime sleeping analysis, a clear U-shaped association with Parkinson disease was observed for established cases; however, this association was attenuated markedly for recent cases and disappeared for prediagnostic cases. This study supports the notion that daytime sleepiness, but not nighttime sleeping duration, is one of the early nonmotor symptoms of Parkinson disease.
authors.affiliation: Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709, USA.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Gao
authors.forename: Xuemei
authors.initials: X
authors.lastname: Huang
authors.forename: Yikyung
authors.initials: Y
authors.lastname: Park
authors.forename: Albert
authors.initials: A
authors.lastname: Hollenbeck
authors.forename: Aaron
authors.initials: A
authors.lastname: Blair
authors.forename: Arthur
authors.initials: A
authors.lastname: Schatzkin
authors.forename: Honglei
authors.initials: H
authors.lastname: Chen
mesh_terms: D000368:Aged; D002940:Circadian Rhythm / Q000502:physiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000175:diagnosis*; D012893:Sleep Wake Disorders / Q000453:epidemiology*; D014481:United States / Q000453:epidemiology