Spontaneous Vigilance Fluctuations in the Daytime

Abstract

ABSTRACT Spontaneous fluctuations of vigilance during the daytime were studied in 412 electroencephalographic (EEG) records from 9 subjects. The EEGs were recorded repeatedly 19–25 times between 0800 and 1900 in each subject. Except during the 5‐min recording periods when seated subjects were examined with their eyes closed, the subjects were encouraged to engage in their normal daytime activities, such as reading and knitting. The changes in vigilance level were indicated by EEG measures based on automatic analysis. Statistical analyses of the data showed that vigilance fluctuations occurred rhythmically with a period between 60 and 110 min. The ultradian vigilance rhythms were detectable even though the subjects were engaged in normal daytime activity. Individual patterns of ultradian rhythms were, however, observed to be relatively unstable when within‐subjects comparisons were made between experiments conducted one to six weeks apart.

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