Do you sleep with the light on in your room? Your heart may not like it
4 hours agoLast Updated: November 4, 2025
1 8 minutes read
Do you sleep with the light on in your room? Your heart may not like it
By | Published: 2025-11-04 14:06:52 | Source: Digital Trends
What happened? If your bedroom isn’t completely dark at night: think streetlights filtering through the curtains, a hallway light left on, or the glow emanating from nearby buildings, your heart may feel the effects, even if you’re sleeping well. A new study conducted American Heart Association It suggests that people who sleep with greater exposure to outdoor and indoor artificial light are more likely to face the risk of heart disease over time.
Joshua Hoehn/Unsplash
The study was conducted on 450 adults without known heart disease, and the amount of artificial light they were exposed to at night was measured.
Those with greater exposure to artificial light showed more brain fatigue, inflammation of the blood vessels, and a significantly higher risk of major heart disease.
Those who lived in areas with bright night lighting were 35% more likely to develop heart disease over 5 years and more than 22% more likely over 10 years.
The effects persisted even after adjusting for factors such as exercise, diet and air pollution.
Women and younger adults appear to be particularly at risk in the data.
Cousin Kyle Registus/Unsplash
This is important because: Research sheds light on how artificial light at night affects your heart.
Your body is built for a cycle: light during the day and dark during the night. Artificial light at night throws this rhythm out of control.
The brain reacts to light at night by triggering a “stress” response, even when you are asleep. This signals your immune system and blood vessels, which can lead to inflammation and damage to your arteries over time.
Suppressing darkness also messes with melatonin (the sleep hormone) and affects blood pressure, heart rate and metabolism, all of which are linked to heart health.
What can I do about it? You don’t have to buy expensive equipment or move to the countryside to keep your heart healthy. Small changes can also help recreate darkness during the night.
Avoid sleeping with the TV or overhead lights on. Also turn off bright night lights in your bedroom.
If you live on a brightly lit street or light leaks into your room, use blackout curtains or an eye mask
You may also consider changing the position of your bed to avoid direct light.
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