Human-factors

Circadian Rhythm

Definition

The body natural 24-hour biological clock that regulates sleep-wake cycles. Disruption from jet lag, night flying, or irregular schedules increases fatigue risk and degrades cognitive performance.

Related Terms

Fatigue

A state of physical or mental exhaustion that degrades pilot performance. Fatigu...

Duty Time Limitations

Regulations limiting the number of hours a pilot can fly and requiring minimum r...

Test your knowledge

Think you understand Circadian Rhythm? Challenge yourself with practice questions covering human-factors and all other ATPL subjects.

Start a Practice Quiz

Or browse all questions by subject