“Daytime” spectrum light sources, flat LED TV and computer screens, white LED streetlamps have exposed us to a lot more BLUE AND ULTRAVIOLET light in recent years, especially at night. According to Guiliano, V (2012) greater exposure to blue light supresses melatonin, changes the circadian sleep rhythm, changes alertness and could be the source of psychological and disease-susceptibility disturbances.

Our vision depends on light, yet blue light has also non-visual effects on health. The daily light and dark cycle regulates the biological clock and when well adjusted creates a sense of wellbeing.

To read more about blue light and sleep, mental alertness and health >>