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Sleeping with a light on could bad for you. Researchers from Tulane University in the USA say any kind of light at bedtime could be bad for your heart. Even a very dim light could harmful. The researchers tests on 11,000 people for a week. The test participants sensors that the amount of light in their bedrooms. People who did not heart disease had an MRI scan three years later. The scans there was a link between sleeping with a light on and changes in the structure of the heart. One change thicker heart muscles. Another change was that people's hearts were less able to blood, stretch, and during heartbeats.

The study is in the European Heart Journal. Lead researcher Professor Lu Qi wrote: "Light pollution has as a new risk factor for cardiovascular disease." He the findings from his study suggest that light while sleeping could "one of the potential strategies for heart disease". The researchers turning off lights, televisions, and smartphones in the bedroom. They said people to get their sleeping environment as dark as possible. They added: "The advice simple and inexpensive: blackout curtains, warm-coloured bedside lighting, and the small standby LEDs on household electronics."