Moderate Ambient Light During Sleep a Factor for Heart Disease and Diabetes


Studies have found that even moderate ambient light during sleep can lead to many serious health problems, SciTechDaily informs.

It’s very common for people to sleep with lights on, but that could be the reason behind many heart diseases, obesity, and diabetes.

A study from Northwestern Medicine found that people who are exposed to even weak ambient light during their night’s sleep can experience damage to their cardiovascular function and increased insulin resistance in the morning.

How Does Light During Sleep Affect a Person’s Health?

The author of the study, Dr. Phyllis Zee, the leader of sleep medicine at Northwestern University Feinberg School of Medicine, stated 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.” In previous studies, researchers have discovered that being exposed to light during the day raises a person’s heart rate by activating the sympathetic nervous system. According to this recent study, people are affected in the same way when they are exposed to light at night, which hinders proper rest.

Why Do People Have Lights On During Sleep?

Sleeping with lights on is very common – 40% of the population is doing it. Some intentionally leave the TV or a bedside lamp on because they find it hard to fall asleep in a dark room. Kids especially want to sleep with lights on because most of them are afraid of the dark and having a light on in their bedroom makes them feel at ease. However, various studies specifically advise against doing this.

Tips for Sleeping Without the Lights On

Being exposed to light during sleep is the main reason why you might feel tired the next morning. But following a few tips and tricks when you can’t sleep can help you get a good night’s sleep you so desperately need. Try to meditate spiritually right before bed, turn off the lights, close the blinds, and draw the curtains to get the best possible rest.

A lot of reasons can keep you up at night. Insomnia statistics show that up to 23% of the adult population struggles with insomnia due to anxiety. Often night is the only time you are left alone with your thoughts and you get to analyze the day that passed as well as the upcoming day. If you are struggling with anxiety before bed, you need to find the root of the problem and look up some activities that can help you relieve anxiety before going to bed.


Reading and writing have always been my way to get a hold of the world, especially when it comes to news. When I'm not writing, reading books, traveling, and going on long walks with my dog are the things I do to recharge my batteries.

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