Fig. 4. –

The individual bands that comprise the theta band (5, 6, 7, 8, and 9 Hz) show a similar pattern of decreasing power from the initial epochs of the REM sleep bout compared the later epochs of same REM sleep bout. Panels A and B are calculated from the 73.4% of REM sleep bouts with decreasing power. The 23.6% of REM sleep bouts that showed increasing power increased from the initial or 2^nd to last epoch to the last epoch of the REM sleep bout (C). Symbols next to data points mean the time point is significantly different from: * 1^st epoch, # 2^nd epoch, + middle epoch, & 2^nd-to-last epoch.