Effects of an alternating work shift on air traffic controllers and the relationship with excessive daytime sleepiness and stress
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Updated: Feb 18, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
Ângela M Freitas1, Mirna Wetters Portuguez1,2, Thaís Russomano3
1Pontifícia Universidade do Rio Grande do Sul, Programa de Pós-Graduação em Medicina e Ciências da Saúde, Porto Alegre RS, Brasil.
Objective:
To evaluate symptoms of stress and excessive daytime sleepiness (EDS) in air traffic control (ATC) officers in Brazil.
Methods:
Fifty-two ATC officers participated, based at three air traffic control units, identified as A, B and C. Stress symptoms were assessed using the Lipp Inventory of Stress Symptoms for Adults, and EDS by the Epworth Sleepiness Scale.
Results:
The sample mean age was 37 years, 76.9% of whom were male. Excessive daytime sleepiness was identified in 25% of the ATC officers, with 84.6% of these based at air traffic control unit A, which has greater air traffic flow, operating a 24-hour alternating work shift schedule. A total of 16% of the ATC officers had stress symptoms, and of these, 62% showed a predominance of physical symptoms.
Conclusion:
The high percentage of ATC officers with EDS identified in group A may be related to chronodisruption due to night work and alternating shifts.
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