Light at Night

There is a growing interest in the role that light plays on human health, particularly nighttime exposure to short-wavelength (blue) light. We welcome you to read a brief overview of what has been demonstrated to date and where this important research is headed. Summary

Light and Health Research

Scientists have concluded that light does more than just affect the visual system. The definition of light should be expanded to include optical radiation entering the eye that affects the circadian, neurobehavioral and neuroendocrine systems.

Recent research has shown that:

Light can alleviate seasonal depression.
Light can increase the length and quality of sleep.
Light can consolidate sleep/activity patterns in Alzheimer's disease patients.
Light can improve the performance of night-shift workers.
Light can improve weight gain in premature infants.
Light regulates melatonin, which has been shown to reduce breast cancer growth in animals.
Light has a direct impact on cortical brain activity.

These studies represent only a portion of the important scientific findings that raise questions about the health impact of lighting used in offices, schools, and homes.

View a list of publications, journal articles, and conference papers on light and health issues by Lighting Research Center scientists.