日中の眠気の基礎的ウルトラディアン成分

概要

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The basic ultradian rhythm of daytime sleepiness was investigated in eight male students using principal component analysis (PCA). After 8 h of sleep, daytime sleepiness was evaluated for every 30 min from 0800 to 1900 by five measures: MSLT, Kwansei-Gakuin Sleepiness Scale (KSS), EEG delta, theta and alpha activities. These measures were applied to the PCA for each subject. The first three eigenvaiues accounted for about 80% of the variance, PC scores were then computed. The time series analysis showed several predominant ultradian peaks in the PC scores for all subjects. These peaks included 8-10, 15 and 22 cycles/day, corresponding to 140-180, 96 and 66 min/cycle. The data suggest that the temporal structure of daytime sleepiness may consist of some ultradian components other than Kleitmans (1963) BRAC frequencies.