[Subjective sleep quality and spectral analysis of electroencephalography during nocturnal sleep].
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.
Vergara
J M
JM
Unidad de Neurofisiología Clínica, Hospital Infantil Miguel Servet, Zaragoza, España.
Brualla
J
J
Serrano
M
M
Arcocha
J
J
López
J
J
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
Calidad subjetiva de sueño y análisis espectral del electroencefalograma de sueño nocturno.