Subjective sleep quality and spectral analysis of electroencephalography during nocturnal sleep
Vergara, J.M.; Brualla, J.; Serrano, M.; Arcocha, J.; López, J.
Revista de Neurologia 28(8): 765-767
1999
ISSN/ISBN: 0210-0010 PMID: 10363318 Document Number: 505865
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. To study the relation between subjective sleep quality and spectral EEG parameters during nocturnal sleep. 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. 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. Sleep depth, measured by spectral analysis, is an important predictor of the subjective sleep quality. The sleep classification in discrete stages ignores this feature.