Abstract
The goal of this study is to contribute to discussions about age-related changes in
electroencephalogram (EEG) complexity. Eight characteristics of complexity were evaluated
for sleep EEG of 175 healthy subjects. The complexity of the sleep EEG significantly
increased up to the age of about 60 years. Over 60 years, the complexity stagnated or slightly
decreased. The same tendencies were manifested during all sleep stages and also during the
episodes of wakefulness.
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