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

Sleeping with the light on might scare away monsters under the bed, but it could be linked to an increased risk of heart disease and diabetes, research suggests.

Light is an important signal by which the body's internal clock, which governs a host of biological processes from temperature to hormone release, is synchronised to the external cycle of day and night.