According to researchers, melatonin influences the body's circadian rhythm, an internal biological clock that regulates sleep-wake cycle, body temperature, endocrine functions and a number of disease processes including heart attack, stroke and asthma.
Male and female shift workers are subject to light pollution, Blask said, and the areas of concern involve colorectal, prostate and endometrial cancers as well as breast cancer.
Blask's research has been supported by grants from the National Institutes of Health, he said, but research is at a near-standstill because funding hasn't been forthcoming,
``More research needs to be done,'' said Blask, who has a doctorate in neuroendocrinology and anatomy and has been at the Research Institute for 17 years.
Blask said the three speakers will have about 10 minutes during the hour-long briefing in the Rayburn House Office Building. The meeting is sponsored by Rep. Gabrielle Giffords, D-Ariz., along with the International Dark-Sky Association.