Recent research has found that might be a problem. Light exposure at night has been linked to higher rates of diabetes, obesity, and hypertension. Last year, researchers connected it to higher rates of heart failure and other cardiovascular problems over 10 years.
This study drew on data from fitness monitors that were worn for a week by a subset of participants in the UK Biobank, which collects health and lifestyle information on half a million people. The monitors contain a light sensor, which allows for an objective measurement of light exposure, says Dr. Lu Qi, a professor of epidemiology at Tulane University and an author of the new study. “That's very unique, because most previous studies have used self-reported light exposure,” he says.
They found that the hearts of people exposed to nighttime light had thicker walls and were less effective at pumping. These changes do not themselves indicate heart disease, but precede its development, says Qi.
How much light is too much light?
With this kind of study, it’s impossible to eliminate the possibility that these heart problems and light exposure are both linked with another unknown factor in these people’s lives. But overall, the research suggests that light exposure at night may be a driver of metabolic and cardiovascular problems.
It’s not entirely clear what was causing the light exposure seen in the data—whether it was lights on elsewhere in the house, lights on in the room, a tablet or other screen on nearby, or perhaps a television left on. But for the moment, the best rule of thumb is to get the room as dark as possible, these studies suggest. It’s also long been a core tenet of sleep hygiene. Turn off the hall light. Put up blackout curtains. Draw an eye mask over your eyes—and know that it could be helping your heart.
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