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The Sleep of Older Subjects Fifteen Years Later

The EEG sleep of 5 subjects originally recorded in their early 50s was recorded 15 yr. later in their mid-60s. Increased within-sleep awakenings were present and shorter sleep stages. A modified slow wave scoring system resulted in an increased amount rather than the previously established decline in slow wave sleep with aging. Interpretive cautions necessary in extended-time studies are noted. Reliability of awakening measures across time was seen.