Falling asleep with the television on may seem innocuous, but exposure to nighttime artificial light could impact your heart health, according to recent research. The study examined data from over 11,000 adults who wore devices to track their light exposure and later underwent heart scans. Findings suggest that those exposed to higher levels of light at night exhibited measurable changes in heart structure and function, including increased left ventricular mass and thicker heart walls.
The body’s circadian rhythm, an internal 24-hour clock, regulates essential functions like sleep and hormone release. Darkness cues the body to rest, while light exposure at night can disrupt this natural rhythm. Researchers found patterns consistent with concentric cardiac remodeling, which may have clinical significance, though the study does not establish a direct causation between nighttime light and heart disease.
In addition to televisions, other light sources such as bedroom lamps and streetlights can contribute to nighttime light exposure. The study highlighted disrupted sleep as a possible link between light exposure and heart changes, as shorter sleep duration partially explained the association. However, further research is needed to fully understand this relationship and whether reducing light exposure can prevent cardiac changes.
To promote better sleep and potentially support heart health, it is advisable to maintain a dark bedroom environment. Simple measures include using a TV sleep timer, turning off unnecessary lights, blocking outdoor light with curtains or blinds, reducing screen use before bed, and keeping a consistent sleep schedule. These practices may improve sleep quality and contribute to overall heart health, although they are not substitutes for other healthy lifestyle choices.
While occasionally falling asleep with the TV on may not pose an immediate risk, consistently sleeping in a brightly lit environment could interfere with restful sleep. If you have concerns about your heart health, it is important to consult with a healthcare professional to discuss your individual risk factors.