title: Differences in findings of nocturnal polysomnography and multiple sleep latency test between narcolepsy and idiopathic hypersomnia.
abstract: OBJECTIVE
  To compare differences in nocturnal and daytime polysomnographic findings between narcolepsy (NA) with and without cataplexy (CA) and idiopathic hypersomnia without long sleep time (IHS w/o LST).
  
  
  METHODS
  Nocturnal polysomnography (n-PSG) and multiple sleep latency test (MSLT) findings were compared among subjects with NA with CA (n=52), NA without CA (n=62), and IHS w/o LST (n=50).
  
  
  RESULTS
  The NA with CA group had significantly more disrupted and shallower nocturnal sleep than the other groups. On MSLT, the IHS w/o LST group had significantly longer sleep latency (SL) compared with the two NA groups. The latter two groups did not show statistical differences in diurnal variation of SL.
  
  
  CONCLUSIONS
  The IHS w/o LST group had milder objective daytime sleepiness compared with the NA groups. In patients with NA, nocturnal sleep disturbances appeared only in cases with CA, despite a similar trend in diurnal changes in sleep propensity between the two NA groups.
  
  
  CONCLUSIONS
  Objective nocturnal sleep disturbances are specific to NA patients with CA, whereas diurnal variations of sleep propensity are observed irrespective of the presence of CA among NA patients. These findings could be helpful for choosing optimal treatment plans for patients with these disorders.
authors: Japan Somnology Center, Neuropsychiatric Research Institute, 1-24-10 Yoyogi, Shibuya-ku, Tokyo, Japan.
authors: Yoichiro
authors: Y
authors: Takei
authors: Yoko
authors: Y
authors: Komada
authors: Kazuyoshi
authors: K
authors: Namba
authors: Taeko
authors: T
authors: Sasai
authors: Masaki
authors: M
authors: Nakamura
authors: Tatsuki
authors: T
authors: Sugiura
authors: Kenichi
authors: K
authors: Hayashida
authors: Yuichi
authors: Y
authors: Inoue
mesh_terms: D000328:Adult; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D020177:Idiopathic Hypersomnia / Q000503:physiopathology*; D008297:Male; D009290:Narcolepsy / Q000503:physiopathology*; D017286:Polysomnography; D055815:Young Adult