pilot's improper planning/decision, and subsequent incapacitation, which resulted in a loss of aircraft control and collision with the terrain. Factors relating to the accident were: pilot fatigued from a long-distance drive with minimal rest, physical impairment of the pilot due to low hydration, his lack of recent experience in abrupt/high-G maneuvering, pilot anxiety/apprehension, the resultant motion sickness of the pilot, and his improper decision to continue flight after experiencing a physiological disturbance, all of which led to vasovagal syncope.