"The findings suggest that REM sleep slow oscillations may translate top-down homeostatic control to widely separated brain regions, whereas fast oscillations synchronizing local neuronal ensembles escape this global command," the researchers said in a paper.

The team said it has inserted high-density electroencephalograms in mice to monitor both slow frequency and fast frequency brainwave activities during REM sleep.

"The study will later be used for research in finding the correlation between particular diseases such as Alzheimer's and sleep disorders," Choi said, adding that the researchers used a brainwave map developed by KIST.

The research was funded by the National Research Council of Science & Technology and the findings were published in the journal "Proceedings of National Academy of Sciences." (Yonhap)