Revelation to artificial light among sunset and bedtime can reduce the quality of your sleep and may enlarge the risk of hypertension and diabetes, research has found.
The study included 116 healthy participants aged 18-30 who were exposed to light, either part or the dark for eight hours before bedtime for five consecutive days. Blood plasma was collected every 30 to 60 minutes to check the levels of voluntary melatonin, a hormone produced at night by the pineal gland in the brain.
Melatonin regulates the sleep-wake cycle and has been shown to regulate blood pressure and body temperature.
The study found that exposure to bright room light before bedtime shortened the duration of melatonin production by about 90 minutes, compared to exposure to dim light. In addition, exposure to bright room light during the usual hours of sleep buy valtrex online discount suppressed melatonin by more than 50 percent.
The study is scheduled for publication in the March issue of the Journal of Clinical Endocrinology & Metabolism.
“Given that chronic light suppression of melatonin has been hypothesized to increase relative risk for some types of cancer and that melatonin receptor genes have been linked to type 2 diabetes, our findings could have important health implications for shift workers who are exposed to indoor light at night over the course of many years,” study author Joshua Gooley, of Brigham and Women’s Hospital and Harvard Medical School in Boston, said in a news release from the Endocrine Society.
“Further research is needed both during construction melatonin suppression as a major risk factor for breast cancer and to determine the mechanisms by which melatonin regulates glucose metabolism” added Gooley.