Fatigue at Work Infographic

Fatigue is the state of feeling very tired, weary or sleepy resulting from insufficient sleep, prolonged mental or physical work, shift work, or extended periods of stress or anxiety.

Boring or repetitive tasks can intensify feelings of fatigue.

One shift worker in five dozes off during a shift. [1]


Staying awake for 24 hours straight affects the human body almost exactly like a blood alcohol level of .10%, which exceeds Canada's legal limit for drivers.

Impacts of fatigue



Night, evening, rotating and irregular shifts are associated with in increased risk of occupational injury due to worker fatigue, less supervision and reduced co-worker support.[2]

Fatigue is regarded as having an impact on work performance. Most accidents occur when people are more likely to want sleep – between midnight and 6 am, and between 1-3 pm.[3]

Fatigue is increased by...

Tips for workers

Advice for employers

[1] http://www.ccohs.ca/newsletters/hsreport/issues/2007/11/ezine.html
[2] http://www.ccohs.ca/oshanswers/ergonomics/shiftwrk.html
[3] Alberta Human Resources and Employment. Fatigue, Extended Work Hours, and Safety in the Workplace in Workplace Health and Safety, June 2004, Reformatted August 2010

Canadian Centre for Occupational Health and Safety