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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Fatigued Teams: Night Work Impairs Team Performance and Cohesion.

Ellyse Greer1, Mikaela Owen1, Peter G Roma2,3

  • 1Behaviour-Brain-Body Research Centre, Adelaide University, Adelaide, SA, Australia.

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|March 12, 2026
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Summary
This summary is machine-generated.

Night work significantly impairs team performance and cohesion, especially during the circadian low. These effects, including reduced alertness and productivity, highlight risks in safety-critical industries.

Keywords:
Circadian MisalignmentDistributed TeamFatigueNight WorkTeamTeam CohesionTeam Performance

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Area of Science:

  • Occupational Health
  • Sleep Science
  • Team Dynamics

Background:

  • Distributed teams in safety-critical industries face fatigue and circadian misalignment during night shifts.
  • While individual impacts are known, night work's effect on team processes is understudied.

Purpose of the Study:

  • To investigate the impact of simulated night work on distributed team performance and cohesion.

Main Methods:

  • 24 participants completed a simulated night shift in a lab setting.
  • Team performance was assessed using the COHESION task at multiple time points.
  • Measures included alertness, cooperation, productivity, team performance, and cohesion.

Main Results:

  • Significant declines in productivity, team performance, and cohesion were observed across the night, peaking at 06:00h.
  • Cooperation and team dynamics also decreased significantly at 06:00h and 10:00h.
  • Poorest outcomes correlated with the circadian low and diminished alertness.

Conclusions:

  • Night work leads to significant degradation in team outcomes, particularly during the circadian low.
  • The circadian system critically influences team performance and cohesion.
  • Fatigue-related disruptions in cooperation and team dynamics persisted beyond the circadian low, emphasizing risks in safety-critical operations.