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In page Charcot–Wilbrand syndrome:

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The diagnosis criteria for posttraumatic stress disorder (PTSD) involve hyper-arousal, disturbed sleeping, and traumatic nightmares with numerous REM-related sub-symptoms.[1] CWS on the other hand marks little to no dreaming, decreased REM sleep to dream linkage, and lack of visual remembrance. The specific physiological changes that take place in CWS patients might help to isolate the dream formation pathways that are hyperactive in PTSD patients and offer clues on how to reduce them.[citation needed]