title: Sleep, daytime symptoms, and cognitive performance in patients with fibromyalgia.
abstract: OBJECTIVE
  To assess sleep, daytime symptoms, and cognitive performance in patients with fibromyalgia (FM).
  
  
  METHODS
  Ten female patients with FM (mean age 32 yrs) and a matched, noncomplaintive comparison group (n = 9; mean age 30 yrs) spent 2 nights in the sleep laboratory. After the 2nd night, subjects completed a computerized 20 min battery of self-assessment and performance tests at hourly intervals from 07:00 to 20:00 h.
  
  
  RESULTS
  Patients with FM spent more time in stage 1 sleep; however, there were no group differences on any other sleep measures. They reported greater sleepiness, more fatigue, more pain, more negative mood, and lower accuracy on performance tasks across a 14 h day. The FM group was slower in speed, but not impaired in accuracy, on performance of complex tasks, i.e., grammatical reasoning, serial addition/subtraction, and a simulated multi-task office procedure.
  
  
  CONCLUSIONS
  Patients with FM have diurnal impairment in speed of performance on complex cognitive tasks, which accompany light stage 1 electroencephalographic (EEG) sleep and their experience of diffuse pain and nonrestorative sleep symptoms of sleepiness, fatigue, and negative mood.
authors.affiliation: University of Toronto Centre for Sleep and Chronobiology, Toronto Hospital, Ontario, Canada.
authors.forename: K A
authors.initials: KA
authors.lastname: C-oté
authors.forename: H
authors.initials: H
authors.lastname: Moldofsky
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D004569:Electroencephalography; D005260:Female; D005356:Fibromyalgia / Q000503:physiopathology*; D006801:Humans; D019954:Neurobehavioral Manifestations; D017286:Polysomnography; D012890:Sleep; D012894:Sleep Stages