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Sleeping with lights on prevents your body from fully relaxing, forcing the cardiovascular system to stay more active than normal during the night.
This hidden overdrive quietly elevates your resting heart rate while you sleep.
Light at night also disrupts glucose processing, causing measurable insulin resistance by morning.
Over time, these nightly disturbances raise
the risk of heart disease and type 2 diabetes.A Northwestern University Feinberg School of Medicine study showed that even moderate room light during sleep is enough to trigger these cardiovascular and metabolic changes.
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