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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Do split sleep/wake schedules reduce or increase sleepiness for continuous operations?

Xuan Zhou1, Charli Sargent1, Anastasi Kosmadopoulos1

  • 1Central Queensland University, Appleton Institute for Behavioural Science, PO Box 42, Goodwood, SA 5034, Australia.

Accident; Analysis and Prevention
|November 10, 2015
PubMed
Summary
This summary is machine-generated.

Split sleep schedules increase subjective sleepiness compared to consolidated schedules, even when cognitive performance remains stable. Individuals on split schedules will likely feel sleepier for at least half their waking hours.

Keywords:
Forced desynchronyShiftworkSplit sleepSubjective sleepiness

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Area of Science:

  • Sleep Medicine
  • Chronobiology
  • Human Physiology

Background:

  • Sleep-wake schedules significantly influence physiological and cognitive functions.
  • Understanding the subjective experience of sleepiness under different sleep patterns is crucial for public health and occupational safety.

Purpose of the Study:

  • To compare the subjective sleepiness experienced under consolidated versus split sleep-wake schedules.
  • To investigate how these schedules impact sleepiness during both biological day and night periods.

Main Methods:

  • A between-group design using forced desynchrony protocols with consolidated and split sleep-wake schedules.
  • Participants underwent 7×28-h days with fixed sleep (9.33h) and wake (18.67h) durations daily.
  • Subjective sleepiness was assessed using the Karolinska Sleepiness Scale every 2.5 hours during wakefulness.

Main Results:

  • Subjective sleepiness was significantly higher during wake periods in the split sleep-wake condition compared to the consolidated condition.
  • This increased sleepiness in the split condition was observed during both biological day and night.
  • While cognitive performance may not be impaired, individuals on split schedules report greater sleepiness.

Conclusions:

  • Split sleep-wake schedules lead to increased subjective sleepiness compared to consolidated schedules, particularly during the first half of the waking period.
  • Individuals adopting split sleep schedules should be informed about the heightened likelihood of feeling sleepy, despite potentially maintained cognitive function.