Sleeping in total darkness can help protect the heart, French physician Dr Vincent Valinducq said in a segment broadcast on TF1's morning programme "Bonjour !" on Wednesday, 16 September 2026.
In the segment, titled "Allô le doc," Valinducq said that alongside regular physical activity and a generally healthy lifestyle, both already recognised as essential for cardiac health, sleeping in complete darkness offers an additional, valuable form of protection for the heart.
Limiting cardiovascular risk
According to the segment, sleeping in total darkness helps limit the risk of cardiovascular disease. TF1info also published a related article on its website warning that not sleeping in total darkness can have consequences for the heart, according to Valinducq.
Exposure to light during the night is known to suppress the body's production of melatonin, the hormone that helps regulate the sleep-wake cycle. Artificial light from sources such as streetlights, screens and household lamps is one of the most common causes of this kind of disruption in modern life. Disrupted circadian rhythms have been linked by researchers to a range of effects on cardiovascular and metabolic health.
Heart disease and prevention
Cardiovascular disease, which includes conditions such as heart attacks and strokes, remains one of the leading causes of death worldwide, including in France. Public health campaigns there regularly promote lifestyle changes such as exercise, balanced diets and adequate sleep as ways to reduce risk. Doctors typically describe cardiovascular risk factors as either modifiable, such as diet, exercise and sleep habits, or non-modifiable, such as age and family history.
Health authorities generally recommend seven to nine hours of sleep a night for adults, along with consistent bedtimes and limited screen use before bed, as part of broader efforts to protect long-term cardiovascular and mental health.
Valinducq's comments reinforced that message, framing a dark bedroom as a simple addition to exercise and healthy eating in protecting the heart, rather than a replacement for either.
About the programme
TF1 is one of France's leading commercial television networks, and "Bonjour !" is its early morning news and lifestyle programme. "Allô le doc" is a recurring segment on the show in which medical professionals answer viewers' health questions, alongside similar features such as "Nos experts vous répondent."
The segment was produced by TF1info's video editorial team and broadcast as part of "Bonjour ! La Matinale." It ran for two minutes and 50 seconds and was published in the health section of TF1info's website on 16 September 2026. The item remains available on TF1info's platform, alongside other recent broadcasts from "Bonjour ! La Matinale."
