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Do you sleep in total darkness, or is there a glow in your bedroom? New, groundbreaking research shows that eliminating light during sleep may help guard you from heart disease. Researchers gathered the data by following UK Biobank participants’ heart health records for over 9 years by monitoring them with a wrist light sensor.
This landmark study is the largest ever on long-term links between personal light exposure and heart disease risk. It analyzed 13 million hours of light data from nearly 89,000 participants averaging 62 years of age. Participants with prior cardiovascular conditions were excluded from the study. The results showed that greater nighttime artificial light exposure was associated with heightened risks of heart disease and stroke.
Those exposed to the brightest nighttime light faced sharply elevated risks: up to 56% overall for multiple heart conditions, including 47% for heart attack, 32% for atrial fibrillation, 30% for stroke, and 32% for coronary artery disease.
Nighttime light triggers heart risks mainly by throwing off your body’s built-in 24-hour circadian rhythm, which earlier research already flags as a cardiovascular red flag. This is the clock that runs your sleep-wake routine, treating light as a stay-alert cue and darkness as a wind-down signal. Disrupting your circadian rhythm can damage the cells lining your arteries, driving up blood pressure and raising the odds of dangerous blood clots.
Light also suppresses your brain’s release of melatonin, the hormone that signals sleep. To counter this, tweak your evening habits by cutting screen time, turning off unneeded lights a few hours before bed, and dim whatever you can’t switch off. Create a pitch-black sleep zone with blackout curtains or a sleep mask, and ditch bright alarm clocks.
A healthy heart depends on steady circadian rhythms, which fine-tune blood vessels, sugar processing, hormones, blood pressure, and heartbeat. Reducing nighttime artificial light could be a game-changing shield for your heart health.
To view the original scientific study click below:
Light Exposure at Night and Cardiovascular Disease Incidence
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