Overtime Fatigue

Physiological Constraint

Human body has a limited capacity for sustained effort before the signs of tiredness begin to appear. When overtime fatigue sets in, the reaction time of the worker slows down and their ability to focus on complex tasks is diminished. This change is not a matter of willpower but a biological response to the lack of rest.

In a manufacturing setting, this means that an operator is more likely to misread a gauge or skip a step in the assembly process. The cumulative effect of several long shifts in a row is much greater than the impact of a single extra hour. Sleep deprivation further compounds the problem, leading to a state where the individual is as impaired as if they were under the influence of alcohol.

Managers must monitor the total hours worked by each person to ensure that they are getting enough time to recover between shifts.

Safety Hazard

Risk of accidents on the shop floor increases significantly when the workforce is exhausted. Overtime fatigue is a leading cause of industrial injuries, from simple trips and falls to more serious incidents involving heavy machinery. A tired worker is less aware of their surroundings and may not notice a warning signal or a coworker in their path.

This lack of situational awareness is particularly dangerous in high speed environments where a mistake can have life changing consequences. The cost of a single accident in terms of legal fees, medical bills and lost productivity far outweighs the benefits of the extra hours. Safety protocols should include a maximum limit on the number of consecutive days a person can work.

Ensuring that everyone is alert and healthy is the most basic responsibility of the site leadership.

Long-term Sustainability

Relying on extra shifts to meet production targets is a sign of a system that is operating beyond its true capability. While overtime fatigue might be acceptable for a few days to recover from a breakdown, it cannot be a permanent solution. The high stress of constant work leads to burnout and a high turnover rate among the staff.

Replacing experienced workers is a slow and expensive process that further reduces the efficiency of the plant. A sustainable operation is one where the demand is matched by the demonstrated capacity of the team during normal hours. Continuous improvement efforts should focus on making the work easier and more efficient rather than just asking people to work longer.

The health of the employees is the foundation of the long term success of the company.