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Delta Component Variations in Human Sleep Electroencephalogram

All night sleep was recorded polygraphically on 14 healthy adults, once for each person, and EEG was analyzed with bandpass filters. The integrated values during successive 10 second epochs were recorded consecutively at 1 mm intervals, separately for each frequency band. The variations of integrated values for long time span were clearly observed, The findings on 1–2 Hz component are reported exclusively in this report.