Even if they are dim lights, and you are used to them, the effects of sleeping with the light on in the room at bedtime is a habit that in the long run has serious consequences on your health
Perhaps sleeping with the light of the cell phone or the television on seems like a harmless habit, but the reality is that in the long term, this habit can have a high cost for your health.
Sleeping with lights in the room can lead to high blood glucose levels and other harmful effects on your heart and metabolism.
Researchers at the Center for Sleep and Circadian Medicine at Northwestern University Feinberg School of Medicine in Chicago analyzed the sleep patterns of 20 healthy young adults who slept for two days in a specialized laboratory under different conditions.
What are the effects of sleeping with the light on
While hooked up to sleep monitors, the participants slept the first night in a very dark room while their brain waves, breathing, heart rate and melatonin levels were monitored. The next night, part of the group slept with a dim light source on the ceiling, the equivalent of streetlights coming in through a window.
The sleep experts noted significant differences between the effects of sleeping with the light on in those who slept both nights in the dark compared to those who spent one night in dim light.
Sleeping in these dim light conditions for a single night raised the study subjects’ heart rate and glucose levels, increased their insulin resistance and blood pressure, although their melatonin levels remained the same.
The authors of the research, published in the Proceedings of the National Academy of Sciences of the United States of America (PNAS).
Ensure that people who are frequently exposed to night light during sleep have a higher risk of developing type 2 diabetes. As sleeping in these conditions for about 10 weeks can negatively affect blood glucose levels.
“The effects of light exposure at night, particularly during sleep, on cardiometabolic function could have implications for those living in modern societies where nighttime indoor and outdoor light exposure is increasingly widespread,”
So, reducing exposure to indoor nightlight during sleep may have beneficial effects on cardiometabolic health.