rhythms to the 0° phase or cortical upstate during endogenous sleep (Fig.3a), the cross-correlation of the gamma and spindle power is maximal at zero-time delay (the median across electrodes and subjects S7–S13 ± the interquartile range is 0.0020 ± 0.16 s) for endogenous...
" notes Paul Saskin, clinical director of the Regional Center for Sleep Disorders at Sunrise Hospital in Las Vegas. "And it is thought that REM is needed for learning and memory. Like a computer backing up its hard drive, the brain is organizing its filing...