title: REM sleep characteristics of nightmare sufferers before and after REM sleep deprivation.
abstract: OBJECTIVE
  To examine whether disrupted regulation of REM sleep propensity is implicated in nightmare (NM) pathophysiology.
  
  
  BACKGROUND
  Heightened REM propensity induced by REM sleep deprivation is belied by increases in REM %, REM density and the dream-like quality of dream mentation during post-deprivation recovery sleep. Compromised regulation of REM sleep propensity may be a contributing factor in the pathophysiology of frequent NMs.
  
  
  METHODS
  A preliminary study of 14 subjects with frequent NMs (> or = 1 NM/week; 27.6+/-9.9 years) and 11 healthy control subjects (<1 NM/month; 24.3+/-5.3 years) was undertaken. Subjects completed home sleep/dream logs and underwent three nights of polysomnographic recording with REM sleep deprivation on night 2. Group differences were assessed for a battery of REM sleep and dream measures on nights 1 and 3.
  
  
  RESULTS
  Several measures, including #skipped early-night REM periods, REM latency, REM/NREM cycle length, early/late REM density, REM rebound, late-night REM% and dream vividness, suggested that REM sleep propensity was abnormally low for the frequent NM group throughout the 3-day study.
  
  
  CONCLUSIONS
  Findings raise the possibility that REM anomalies recorded from NM sufferers sleeping in the laboratory environment reflect a disruption of one or more endogenous regulators of REM sleep propensity.
authors.affiliation: Dream and Nightmare Laboratory, Centre détude du sommeil, Hôpital du Sacré-Coeur de Montréal, 5400 boul. Gouin Ouest, Montréal, Que., Canada H4J1C5. tore.nielsen@umontreal.ca
authors.forename: Tore A
authors.initials: TA
authors.lastname: Nielsen
authors.forename: Tyna
authors.initials: T
authors.lastname: Paquette
authors.forename: Elizaveta
authors.initials: E
authors.lastname: Solomonova
authors.forename: Jessica
authors.initials: J
authors.lastname: Lara-Carrasco
authors.forename: Ani
authors.initials: A
authors.lastname: Popova
authors.forename: Katia
authors.initials: K
authors.lastname: Levrier
mesh_terms: D000328:Adult; D004325:Dreams / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D017286:Polysomnography; D011569:Psychiatric Status Rating Scales; D011581:Psychological Tests; D012890:Sleep / Q000502:physiology; D012892:Sleep Deprivation / Q000503:physiopathology*; D012895:Sleep, REM / Q000502:physiology*