Abstract

The appearance of electroencephalogram (EEG) alpha activity in a multiple sleep latency test was quantitatively analysed using percentage time alpha. Two components were extracted from the temporal change in smoothed percentage time alpha: a general level showing a progressive decrease and a cyclic variation with a mean interval of 39.8 s. The cyclic variation of percentage time alpha was evident during the period of the general level below 50%. The arousal cycle in the drowsy state is discussed.

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