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A 2 Night Study, Involving 20 Persons, Indicates That Sleeping With Light On, At Night, Increases The Risk For Heart Disease And Diabetes. The Study May Have Attributed The Cause To The Body Being Kept More Alert Via The Light Activation Of The Autonomic Nervous System. However, Further Larger Studies Are Advised To Confirm This Result.

Sleeping with light on linked to higher risk of heart disease and diabetes | Sleep | The Guardian

https://www.theguardian.com/society/2022/mar/14/sleeping-with-light-on-linked-to-higher-risk-of-heart-disease-and-diabetes

Exposure to artificial light at night worsens glucose and cardiovascular regulation, research suggests