Throughout his sessions he found no sudden onset of irregularity in her sleep, but he observed a few persistent abnormalities, including a significantly reduced amount (and much larger than average variance in duration) of REM sleep and an unusually high number of sleep spindles.
He found no sudden onset of irregularity in her sleep. This was throughout his sessions. He observed a few persistent abnormalities. This was including a significantly reduced amount (and much larger than average variance in duration) of REM sleep. This was including an unusually high number of sleep spindles.