00:00Light at night may be doing more than disrupting sleep.
00:02A new study links higher nighttime light exposure to changes in heart structure.
00:07Researchers studied 11,071 people from the UK Biobank.
00:12Each participant wore a wrist light sensor for seven days.
00:15Three years later, researchers used cardiac MRI scans.
00:19They compared people exposed to more than three lux with those exposed to almost no light.
00:24Higher exposure was linked to a thicker left ventricle wall.
00:27That thickening reduced the chamber's available space.
00:30Researchers also found the heart muscle was less flexible during each beat.
00:35Changes were also seen in the right ventricles and left atria.
00:39The findings point to broader changes in the heart structure and function.
00:43Researchers described this process as cardiac remodeling.
00:46The study adds to evidence connecting nighttime light with cardiovascular health.
00:51Experts say doctors should consider patients' nighttime light environments.
00:54Simple steps include darker bedrooms, blackout curtains, and less screen light after sunset.
01:00The researchers say reducing nighttime light could become one potential strategy for protecting heart health.
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