sentences:  Software developers, engineers and scientists develop fatigue detection software using various physiological cues to determine the state of fatigue or drowsiness.The measurement of brain activity (electroencephalogram) is widely accepted as "the" standard in fatigue monitoring.Other technology used to determine fatigue related impairment include behavioural symptom measurements such as; eye behaviour, gaze direction, micro-corrections in steering and throttle use as well as heart rate variability.