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Updated: May 25, 2026
08:36
Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
12-h or 8-h shifts? It depends
Sally A Ferguson1, Drew Dawson
1Centre for Sleep Research, University of South Australia, GPO Box 2471, Adelaide, SA 5001, Australia. sally.ferguson@unisa.edu.au
Sleep Medicine Reviews
|February 7, 2012
Summary
Evaluating shift work requires a holistic approach. Simply comparing 8-hour versus 12-hour shifts is insufficient; a systems-based risk management strategy is essential for understanding working time arrangements.
Area of Science:
- Occupational Health
- Workforce Management
- Human Factors Engineering
Background:
- The debate on whether 8-hour or 12-hour shifts are superior is ongoing.
- Existing research often relies on small-scale studies with confounding variables and limited perspectives.
- Bias from various stakeholders can influence research outcomes and interpretations.
Purpose of the Study:
- To critically review the evaluation of shift work patterns, specifically 8-hour versus 12-hour shifts.
- To highlight the limitations of assessing shift length in isolation.
- To propose a more comprehensive approach to understanding the impact of working time arrangements.
Main Methods:
- Literature review of studies comparing 8-hour and 12-hour shifts.
- Analysis of factors influencing shift work outcomes beyond shift length.
- Conceptualization of working time arrangements as a complex system.
Main Results:
- Shift length is only one of many factors influencing work outcomes.
- Other critical factors include start times, shift patterns, overtime, work type, and workforce demographics.
- Different outcome measures (e.g., sleep, domestic life, safety, health) can yield conflicting results.
Conclusions:
- Evaluating shift work solely on shift length is inadequate.
- A systems-thinking approach, managing 'system' risk, is more appropriate for complex working time arrangements.
- Considering the entire 'ecosystem' of work factors is crucial for effective management.
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