title: Characterizing recovery of sleep after four successive night shifts.
abstract: The purpose of this study was to characterize the recovery pattern of sleep following simulated, four successive night shifts in ten healthy men (22.9 + or - 3.2 yr). Poor sleep was defined as sleep efficiency of 80% or lower as determined actigraphically. The results showed that four (rapid, slow, pseudo, and incomplete) patterns of sleep recovery were observed over three recovery sleep periods. The rapid and slow recovery pattern represented immediate and slow return to baseline level prior to the nightshifts, respectively. The pseudo recovery pattern demonstrated poor sleep at the 3rd recovery sleep period, despite transient recovery at the 2nd sleep period. The incomplete recovery pattern was characterized by consistently poorer sleep during the entire recovery period. The correlation analysis indicated that sleep habits (bed time and variation of wake time) prior to the experiment were significantly related to the recovery patterns, rather than performance and alertness during the night shifts.
authors.affiliation: National Institute of Occupational Safety and Health, 6-21-1 Nagao, Tama-ku, Kawasaki 214-8585, Japan. kubo@h.jniosh.go.jp
authors.forename: Tomohide
authors.initials: T
authors.lastname: Kubo
authors.forename: Masaya
authors.initials: M
authors.lastname: Takahashi
authors.forename: Norihide
authors.initials: N
authors.lastname: Tachi
authors.forename: Hidemaro
authors.initials: H
authors.lastname: Takeyama
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ebara
authors.forename: Tatsuki
authors.initials: T
authors.lastname: Inoue
authors.forename: Toshimasa
authors.initials: T
authors.lastname: Takanishi
authors.forename: Gen-i
authors.initials: GI
authors.lastname: Murasaki
authors.forename: Toru
authors.initials: T
authors.lastname: Itani
mesh_terms: D056044:Actigraphy; D000222:Adaptation, Physiological; D000328:Adult; D004198:Disease Susceptibility; D006184:Habits; D006801:Humans; D007564:Japan; D008297:Male; D020178:Sleep Disorders, Circadian Rhythm / Q000503:physiopathology* / Q000517:prevention & control; D013647:Task Performance and Analysis; D014851:Wakefulness