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Single case 3: 80-year-old-man (healthy subject) who shows an “increase in N1/S1” in the sleep scoring parameters. For details see Fig. 1. Note the relatively high number of arousals and the low delta and spindle intensity. As seen specifically in the second sleep cycle, many sleep stages scored as S2 according to R&K were scored as N1 according to AASM because of cortical arousals. For an example see the lower part of the figure.
