Ivy Mason, who at the time of the study was post-doctoral fellow at Northwestern and now is a research fellow at Harvard Medical School. “In addition to sleep, nutrition and exercise, light exposure during the daytime is an important factor for health, but during the night we show that even modest intensity of light can impair measures of heart and endocrine health,” said co-first author Dr. Light and its relationship to health is double-edged. A significant proportion of individuals (up to 40%) sleep with a bedside lamp on or with a light on in the bedroom and/or keep the television on. The sleep physiology is not resting the way it’s supposed to.” Exposure to artificial light at night during sleep is commonĮxposure to artificial light at night during sleep is common, either from indoor light-emitting devices or from sources outside the home, particularly in large urban areas. “It acts like the brain of somebody whose sleep is light and fragmented. “But the brain senses it,” Grimaldi said. The participants in the study weren’t aware of the biological changes in their bodies at night. We show it’s affecting your ability to regulate glucose,” Zee said. “Now we are showing a mechanism that might be fundamental to explain why this happens. They were more overweight and obese, Zee said. Over time, your blood sugar goes up.Īn earlier study published in JAMA Internal Medicine looked at a large population of healthy people who had exposure to light during sleep. To make up for it, your pancreas makes more insulin. Insulin resistance is when cells in your muscles, fat and live don’t respond well to insulin and can’t use glucose from your blood for energy. Investigators found insulin resistance occurred the morning after people slept in a light room. How nighttime light during sleep can lead to diabetes and obesity Sympathetic takes charge during the day and parasympathetic is supposed to at night, when it conveys restoration to the entire body. There are sympathetic and parasympathetic nervous systems to regulate our physiology during the day and night. Usually, your heart rate together with other cardiovascular parameters are lower at night and higher during the day.” “Even though you are asleep, your autonomic nervous system is activated. Daniela Grimaldi, a co-first author and research assistant professor of neurology at Northwestern. “We showed your heart rate increases when you sleep in a moderately lit room,” said Dr. Heart rate increases in light room, and body can’t rest properly The study was published on March 14, 2022, in PNAS. “Our results indicate that a similar effect is also present when exposure to light occurs during nighttime sleep,” Zee said. There is already evidence that light exposure during daytime increases heart rate via activation of the sympathetic nervous system, which kicks your heart into high gear and heightens alertness to meet the challenges of the day. “It’s important for people to avoid or minimize the amount of light exposure during sleep.” Phyllis Zee, chief of sleep medicine at Northwestern University Feinberg School of Medicine and a Northwestern Medicine physician. “The results from this study demonstrate that just a single night of exposure to moderate room lighting during sleep can impair glucose and cardiovascular regulation, which are risk factors for heart disease, diabetes, and metabolic syndrome,” said senior study author Dr. Exposure to even moderate ambient lighting during nighttime sleep, compared to sleeping in a dimly lit room, harms your cardiovascular function during sleep and increases your insulin resistance the following morning, reports a new Northwestern Medicine study. Your heart rate rises, and body can’t rest properly in light bedroom at nightĬlose the blinds, draw the curtains and turn off all the lights before bed.Sleeping in a moderately light room increases risk for heart disease and diabetes.Exposure to artificial light at night during sleep is common. Close the Blinds During Sleep To Protect Your Health
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