title: Analysis of rapid eye movement periodicity in narcoleptics based on maximum entropy method.
abstract: We examined REM sleep periodicity in typical narcoleptics and patients who had shown signs of a narcoleptic tetrad without HLA-DRB1*1501/DQB1*0602 or DR2 antigens, using spectral analysis based on the maximum entropy method. The REM sleep period of typical narcoleptics showed two peaks, one at 70-90 min and one at 110-130 min at night, and a single peak at around 70-90 min during the daytime. The nocturnal REM sleep period of typical narcoleptics may be composed of several different periods, one of which corresponds to that of their daytime REM sleep.
authors.affiliation: College of Medical Technology, Hokkaido University, Sapporo, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Honma
authors.forename: N
authors.initials: N
authors.lastname: Ohtomo
authors.forename: M
authors.initials: M
authors.lastname: Kohsaka
authors.forename: N
authors.initials: N
authors.lastname: Fukuda
authors.forename: R
authors.initials: R
authors.lastname: Kobayashi
authors.forename: S
authors.initials: S
authors.lastname: Sakakibara
authors.forename: F
authors.initials: F
authors.lastname: Nakamura
authors.forename: T
authors.initials: T
authors.lastname: Koyama
mesh_terms: D000328:Adult; D002540:Cerebral Cortex / Q000503:physiopathology; D002940:Circadian Rhythm / Q000502:physiology*; D019277:Entropy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009290:Narcolepsy / Q000175:diagnosis / Q000503:physiopathology*; D017286:Polysomnography; D012815:Signal Processing, Computer-Assisted; D012895:Sleep, REM / Q000502:physiology*