title: Nightmares that mislead to diagnosis of reactivation of PTSD.
abstract: BACKGROUND
  Sleep disturbance is a common characteristic of patients with post-traumatic stress disorder (PTSD). Besides the clinical descriptions of nightmares and insomnia, periodic limb movements (PLMs) are reported to co-occur in PTSD. Although the causal relationship between sleep disturbance and PTSD is not fully understood, sleep disturbance is an independent risk factor for the development and reactivation of PTSD. In contrast, the link between PTSD and REM sleep behaviour disorder (RBD) is less clear.
  
  
  METHODS
  A case report is presented to illustrate differential diagnosis and time course of sleep disturbance in the context of PTSD.
  
  
  RESULTS
  A 63-year-old man who had been successfully treated for PTSD but who suffered the re-occurrence of disturbed sleep due to RBD and PLM, which was misdiagnosed as reactivation of PTSD.
  
  
  CONCLUSIONS
  RBD can mimic PTSD-related nightmares. Accurate diagnosis of sleep disturbance in PTSD is relevant for treatment and prognostic evaluation.
authors.affiliation: Department of Psychiatry, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Roepke
authors.forename: Marie-Luise
authors.initials: ML
authors.lastname: Hansen
authors.forename: Anita
authors.initials: A
authors.lastname: Peter
authors.forename: Angela
authors.initials: A
authors.lastname: Merkl
authors.forename: Carla
authors.initials: C
authors.lastname: Palafox
authors.forename: Heidi
authors.initials: H
authors.lastname: Danker-Hopfe
keywords: REM sleep behaviour disorder; nightmares; periodic limb movements; posttraumatic stress disorder; sleep disturbance
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