“…A lower EEG-power ratio both for deep sleep periods 1 and 2 of the cognitive induction night in comparison with the reference night was observed. As stated before, an increase in the EEG-power ratio applied, reflects a slowing of the EEG, whereas a decrease in EEG-power ratio is indicative of an EEG-acceleration (Muresanu et al, 2008). Also an increase in relative power in the high frequency EEG bands was found in the night 2,0 1,9 1,8 1,7 1,6 1,5 1,4 1,3 1,2 1,1 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1…”