EEG alpha power and laterality during dreaming in N-REM and REM sleep

In the present study，electroencephalic (EEG) alpha power，alpha frequency and their individual laterality were studied. The dream data used in this study were collected during N-REM and REM sleeps for 3 or 4 nights. In N-REM sleep，the alpha power spectrum tend to show higher value in dreaming than in non dreaming.
On the other hand，the decrement of the alpha power in REM sleep was rather apparent during dreaming. The correlation between the alpha power and the mean alpha frequency was significantly positive，while as ignificantly negative correlation was seen in N-REM sleep. Finally，we discussed the relation between the cortical activation and the alpha activities in dreaming on the basis of the results we obtained.