Sleeping in the dark to protect our health. This is what scientists from Northwestern University in Illinois in the United States say following a study published in the journal PNAS. Specifically, the study finds that exposure to even moderate ambient lighting during nighttime sleep, compared to sleeping in a dimly lit room, impairs cardiovascular function during sleep and increases insulin resistance the next morning. The experiment conducted on 20 adults revealed that one night of “moderate light exposure” was enough for the body to experience the harmful effects. Study co-author Dr Daniela Grimald said she found that people exposed to just 100 lux while they slept had an increased heart rate compared to those in the low-light group.
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The heart rate
Usually, the heart rate along with other cardiovascular parameters is lower at night and higher during the day. Disruption of the normal cardiovascular pattern, which normally sees the heart rate slow down at night while the body sleeps, harms heart health as the organ does not get the restorative pause it normally would. insulin which occurs when muscle, fat and liver cells do not respond well to the sugar-regulating hormone and cannot use blood glucose for energy. In response to this resistance, the pancreas produces more insulin, which can lead to increased blood sugar levels, a risk factor for developing diabetes.
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I test
Tests on participants showed that those who slept in moderate light had a 15% increase in insulin resistance the next morning, compared with a 4% decrease in those who slept in low light conditions. ” Results from this study show that just one 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 the author. study senior, Dr. Phyllis Zee, chief of sleep medicine at Northwestern University Feinberg School of Medicine and a Northwestern Medicine physician. “It is important that people avoid or minimize the amount of light exposure while sleeping.”
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“If you can see things very well, it’s probably too clear,” added the study’s author. Phyllis Zee and suggested that people who need some light, such as an elderly person who needs to make sure they don’t trip over, should use a dim light near the floor.