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Updated: Jul 12, 2025

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Interindividual variability in coherence between self-reported alertness and performance in shift workers.

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  • 1Centre for Study and Treatment of Circadian Rhythms, Douglas Mental Health University Institute, Department of Psychiatry, McGill University, Quebec, Canada.

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Summary
This summary is machine-generated.

Night shift work can cause significant differences in how police officers perceive their alertness versus their actual performance. This variability highlights challenges in relying solely on self-reported alertness for shift workers.

Keywords:
AlertnessCircadian misalignmentNight shift workPerformance

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Area of Science:

  • Occupational Health
  • Sleep Medicine
  • Psychology

Background:

  • Self-reported alertness may not accurately reflect objective performance impairments.
  • Night shift work is common in professions like policing and can impact vigilance.

Purpose of the Study:

  • To investigate the concordance between subjective alertness and objective vigilance performance in police officers working night shifts.
  • To determine if self-appraisal of vigilance aligns with performance during night shift work.

Main Methods:

  • Observational study involving 76 police officers over one month.
  • Utilized self-reported alertness measures and a psychomotor vigilance task (PVT).
  • Data collected across 2- and 3-shift systems during night shifts.

Main Results:

  • Alertness and reaction speed decreased with time awake.
  • Group-level analysis showed a positive correlation between alertness and reaction speed during night shifts.
  • Significant individual variability observed: 63.6% showed coherent changes, while others reported mismatched alertness and performance.

Conclusions:

  • Substantial interindividual differences exist in how police officers perceive vigilance impairment from night shift work.
  • Self-appraisal of vigilance may not be a reliable indicator of performance deficits in night shift workers.
  • Findings underscore the need for objective performance monitoring in addition to subjective reports.