title: The relationship between subjective sleep estimation and objective sleep variables in depressed patients.
abstract: BACKGROUND
  To our knowledge there is no evidence in the literature about the relationship between subjective sleep estimation and objective sleep variables in depression. It is not known whether the subjective estimation of sleep quality and sleep duration is directly related to any objective sleep variable in depressed patients.
  
  
  METHODS
  Thirty patients with major depression and 10 healthy subjects have been investigated in our sleep laboratory during 1 or 2 consecutive nights after 1 night for adaptation. Every subject, after final awakening in the laboratory, answered questions concerning the subjective feelings about sleep duration, number of awakenings and sleep depth. We compared the sleep estimation in both groups and calculated the correlation between objective and subjective sleep variables in depressed patients.
  
  
  RESULTS
  The degree of a wrong sleep estimation in depressed patients is larger than in healthy subjects. Slow wave sleep (SWS) in depressed patients correlates positively with the subjective estimation of sleep duration. Eye movement density in REM sleep correlates with the subjective estimation of the number of awakenings.
  
  
  CONCLUSIONS
  SWS in depression has a positive influence on the subjective feeling of sleep duration while phasic REM sleep activity has a negative influence.
authors.affiliation: Sackler School of Medicine, Tel-Aviv University, The Y. Abarbanel Mental Health Center, 15 Keren Kayemet St., 59100, Bat-Yam, Israel.
authors.forename: V S
authors.initials: VS
authors.lastname: Rotenberg
authors.forename: P
authors.initials: P
authors.lastname: Indursky
authors.forename: L
authors.initials: L
authors.lastname: Kayumov
authors.forename: P
authors.initials: P
authors.lastname: Sirota
authors.forename: Y
authors.initials: Y
authors.lastname: Melamed
mesh_terms: D003866:Depressive Disorder / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017286:Polysomnography; D011569:Psychiatric Status Rating Scales; D012649:Self Concept; D012890:Sleep / Q000502:physiology*; D012894:Sleep Stages / Q000502:physiology; D012895:Sleep, REM / Q000502:physiology; D014851:Wakefulness / Q000502:physiology