title: [Subjective sleep quality and spectral analysis of electroencephalography during nocturnal sleep].
abstract: BACKGROUND
  The relation between subjective sleep quality and the stages of polysomnography is unclear. Computerized sleep analysis provides a reliable tool for the study of sleep dynamics.
  
  
  OBJECTIVE
  To study the relation between subjective sleep quality and spectral EEG parameters during nocturnal sleep.
  
  
  METHODS
  Nocturnal sleep were recorded ambulatory in 26 subjects aged from 8 to 63. The following variables were extracted from EEG signal (Fz-Pz) quantified through the Fast Fourier Transformation (FFT): delta maximum, spectral peak, delta sleep time, efficiency and desynchronized sleep. A sleep diary was administered in the morning to assess the subjective sleep quality. Multiple regression and Anova were used for statistical analysis.
  
  
  RESULTS
  Efficiency and delta maximum became significant predictors accounting for 54% of subjective sleep variance. The item 'how was your sleep?' was answered in a different way according to the delta maximum.
  
  
  CONCLUSIONS
  Sleep depth, measured by spectral analysis, is an important predictor of the subjective sleep quality. The sleep classification in discrete stages ignores this feature.
authors.affiliation: Unidad de Neurofisiología Clínica, Hospital Infantil Miguel Servet, Zaragoza, España.
authors.forename: J M
authors.initials: JM
authors.lastname: Vergara
authors.forename: J
authors.initials: J
authors.lastname: Brualla
authors.forename: M
authors.initials: M
authors.lastname: Serrano
authors.forename: J
authors.initials: J
authors.lastname: Arcocha
authors.forename: J
authors.initials: J
authors.lastname: López
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002940:Circadian Rhythm / Q000502:physiology*; D004569:Electroencephalography; D006801:Humans; D008875:Middle Aged; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires
vernacular_title: Calidad subjetiva de sueño y análisis espectral del electroencefalograma de sueño nocturno.