Exposure to Normal Indoor Light During Night Shifts Facilitates Circadian Adaptation

Introduction: Working at night is challenging because it can be difficult for the circadian system to adapt to a nocturnal schedule. The intensity of light exposure during the night-time is likely to be a major determinant of the rate of adaptation. The aim of this study was to examine the degree to which the circadian system adapts to a nocturnal schedule when exposed to different indoor ambient lighting conditions – normal (350 lux), moderate (100 lux), and dim (10 lux).