The effects of regularizing sleep-wake schedules on daytime sleepiness

Rachel Manber, Richard R. Bootzin, Christine Acebo, Mary A. Carskadon

Research output: Contribution to journalArticlepeer-review

132 Scopus citations


The present study evaluated the differential effects of two manipulations of sleep-wake schedules on daily subjective ratings of daytime sleepiness of college undergraduate students. Two experimental conditions were compared: a sleep only group and a regularity group. Subjects in both conditions were given a lower limit for total sleep time (7.5 hours). Subjects in the regularity group received an additional instruction to keep a regular sleep schedule. The study was longitudinal and prospective. Following a baseline period (12 days), the experimental conditions were introduced. The experimental phase lasted 4 weeks and overall compliance was good. A follow- up phase (1 week) began 5 weeks past termination of the experimental phase. The findings indicated that when nocturnal sleep is not deprived, regularization of sleep-wake schedules is associated with reduced reported sleepiness. Subjects in the regular schedule condition reported greater and longer lasting improvements in alertness compared with subjects in the sleep only condition and reported improved sleep efficiency.

Original languageEnglish (US)
Pages (from-to)432-441
Number of pages10
Issue number5
StatePublished - 1996
Externally publishedYes


  • Daytime sleepiness
  • Sleep duration
  • Sleep-wake schedule

ASJC Scopus subject areas

  • Clinical Neurology
  • Physiology (medical)


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