1. A method for recognizing fatigue, comprising: ascertaining a first saccade and at least one further saccade of an eye movement of a person, using a gaze direction signal that models the eye movement; determining a first data point representing a first amplitude of the first saccade and a first peak velocity of the first saccade, and at least one further data point representing a further amplitude of the further saccade and a further peak velocity of the further saccade, using the gaze direction signal; and comparing the first data point and at least the further data point with a saccade model, the person being recognized as fatigued if the first and further data points have a predetermined relationship to a confidence region of the saccade model.