Using Light to Facilitate Circadian Entrainment from Day to Night Flights.

As part of a larger project to provide recommendations regarding limitations and best practices for shifting aviators from day to night operations, a study was conducted to assess the efficacy of high energy visible (HEV) light to shift the circadian rhythm in humans. The study attempted to replicate the patterns of military aviators who could be required to shift abruptly from day to night flight operations. Simulated flight performance and salivary melatonin levels of 10 U.