Woman in China develops obesity and health issues linked to sleeping with lights on
A 20-year-old woman in Ningbo has reportedly developed obesity, high blood sugar, and hypertension after years of sleeping with lights on. Doctors warn that prolonged night-time light exposure may disrupt metabolism and increase the risk of weight gain.
- A university student in Ningbo saw her weight rise to around 100kg, alongside high blood sugar and hypertension.
- Doctors say sleeping with lights on can disrupt melatonin and metabolic functions, contributing to weight gain.
- Research shows night-time light exposure increases risks of obesity, insulin resistance, and overeating.
CHINA: A 20-year-old university student in Ningbo has raised concerns after developing multiple health issues believed to be linked to her long-term habit of sleeping with lights on.
According to reports, the woman’s weight increased to approximately 100kg, while medical checks revealed elevated fasting blood glucose levels and high blood pressure.
The case has sparked widespread discussion about the relationship between night-time light exposure and overall health.
Doctor Explains Impact on Sleep and Hormones
Dr Zheng Tianming from the sleep medicine department at Ningbo University Affiliated Kangning Hospital said such cases are not uncommon in clinical practice.
He explained that light exposure during sleep can penetrate the eyelids and stimulate retinal cells, causing the brain to misinterpret the environment as daytime.
This suppresses the production of melatonin, a hormone that regulates sleep cycles, ultimately disrupting the body’s natural circadian rhythm.
Even minor disruptions over time can significantly affect metabolic functions, contributing to weight gain and other health issues.
Research Links Night Light to Weight Gain
Scientific findings have also supported the link between artificial light at night and obesity.
A study published in JAMA Internal Medicine in 2019 tracked over 43,000 women over five years.
The study found that compared to those sleeping in complete darkness:
- The risk of gaining more than 5kg increased by 17%
- The risk of becoming overweight rose by 22%
- The risk of obesity increased by 33%
Researchers concluded that exposure to artificial light at night may significantly impact long-term weight management.
Metabolic and Appetite Disruptions Identified
Experts noted that night-time light exposure may lead to insulin resistance, reducing the body’s ability to regulate blood sugar effectively.
As a result, the pancreas produces more insulin, which can promote fat storage and weight gain over time.
Additionally, light-induced sleep disruption can affect hormones responsible for appetite control.
Dr Zheng explained that:
- Leptin, which signals fullness, may decrease
- Ghrelin, which stimulates hunger, may increase
This imbalance can lead to stronger cravings, especially for high-calorie foods, even if the person does not eat during the night.
Doctors Urge Caution Over Night Lighting
Medical professionals warned that even seemingly harmless sources such as night lights or televisions can have long-term effects on health.
They advised individuals to maintain a dark sleeping environment to support healthy sleep patterns and metabolic function.
“Do not underestimate a small night light in the bedroom,” Dr Zheng said, noting it could become an “invisible threat” to health if used over prolonged periods.
Authorities and experts continue to emphasise the importance of proper sleep conditions in maintaining overall well-being.
