MissAbiotic is mostly wrong. REM atonia (the bodily paralysis) happens during
REM sleep, to stop you from acting out your dreams. Sleep walking and sleep talking are occurring during SWS- stages 3 and 4, not REM. If someone has a problem with attacking people in their sleep, it's typically REM Behavior Disorder because they don't have REM atonia and act out their dreams,
not someone sleepwalking. Those are mostly legal excuses and greatly exaggerated stories in bad tv shows. It's a very common misconception that sleep walking is people acting out their dreams.
I don't know anything about sleep-talking, but I suggest you recommend to her that she contact a sleep specialist rather than rely on the often incredibly shoddy advice available on the internet

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