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The aim of this study was to clarify the electroencephalogram (EEG) characteristics of sleep stage 2 (S2) by using a new scoring system of 5s-EEG stages. Twelve healthy university students (nine females and three males, 20 to 24 years) with no nocturnal sleep complaints took a nap for 1 h from 14:00. EEG during S2 from the onset of the first spindle to sleep stage 3 was manually scored into 5-s epochs...
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