{"id":3946,"date":"2026-01-20T15:00:35","date_gmt":"2026-01-20T15:00:35","guid":{"rendered":"https:\/\/bangbizarre.com\/index.php\/2026\/01\/20\/sleeping-with-light-on-may-boost-risk-of-heart-disease-death\/"},"modified":"2026-01-20T15:00:36","modified_gmt":"2026-01-20T15:00:36","slug":"sleeping-with-light-on-may-boost-risk-of-heart-disease-death","status":"publish","type":"post","link":"https:\/\/bangbizarre.com\/index.php\/2026\/01\/20\/sleeping-with-light-on-may-boost-risk-of-heart-disease-death\/","title":{"rendered":"Sleeping with light on may boost risk of heart disease death"},"content":{"rendered":"

2026-01-20 15:00:34<\/b>
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Sleeping with a light on could sharply increase the risk of heart disease and death.

\nUS and Australian scientists tracked almost 90,000 Britons over nearly a decade and found that those exposed to brighter light while asleep were significantly more likely to develop serious cardiovascular conditions.

\nThe team warned that artificial light disrupts the body\u2019s internal clock – known as the circadian rhythm – placing strain on the heart over time.

\nParticipants were given wrist-worn sensors to measure light exposure during sleep. Researchers then compared this data with later diagnoses of coronary artery disease, heart attacks, heart failure, atrial fibrillation and strokes.

\nThe findings were stark. People with the highest night-time light exposure were 56 per cent more likely to develop heart failure and 47 per cent more likely to suffer a heart attack than those who slept in darkness.

\nThey were also 32 per cent more likely to develop coronary artery disease and 30 per cent more likely to have a stroke. Women exposed to higher levels of light at night faced an even greater risk of coronary artery disease than men.

\nWriting in the journal JAMA Network Open, the researchers said: “Night light exposure was a significant risk factor for developing cardiovascular diseases over 40s.

\n“Avoiding light at night may be a useful strategy for reducing risks of cardiovascular diseases.”

\nProfessor Frank Scheer, a neuroscientist at Brigham and Women\u2019s Hospital in Boston and a study co-author, said reducing light exposure was a simple but powerful step.

\nHe added: “For something like light exposure at night, there\u2019s no downside to keeping it dark other than using a dim light for safely getting out of bed.

\n“If you keep light really dim, below five lux, which is the equivalent of five candles at arm\u2019s length, you can still see your surroundings, but it has minimal effect on your circadian system.”

\nDr. Daniel Windred, a sleep health researcher at Flinders University in Adelaide, said the strength of the findings surprised even the scientists.

\nHe added: “To see close to a 60 per cent increased risk of heart failure with bright night light was surprising.

\n“If you disrupt these rhythms over a long enough period of time, chronically, you possibly elevate people\u2019s risk of cardiovascular diseases.”
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