Biomathematical Fatigue Modeling is an optional component of Fatigue Risk Management Systems. Developed by the US army – Sleep, Activity, Fatigue and Task Effectivenes (SAFTE) after many years of research and financial investment is a widely used Fatigue Modeling Tool. The disadvantage of many fatigue modeling system is the lack of input of sleep data to predict alertness. The solution offered takes into account an individual’s objectively measured sleep data to predict alertness before the next sleep episode. This enables the individual to implement fatigue mitigation strategies before the dip in alertness occurs.