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

The study is published in the European Heart Journal. Lead researcher Professor Lu Qi wrote: "Light pollution [was / has] emerged as a new risk [factor / factory] for cardiovascular disease." He added the findings from his study suggest that [reduce / reducing] light while sleeping could be "one of the potential [strategy / strategies] for preventing heart disease". The researchers [suggested / warned] turning off lights, televisions, and smartphones in the bedroom. They said people needed to [let / get] their sleeping environment as dark as [possibly / possible] . They added: "The advice is [simple / sample] and inexpensive: blackout curtains, warm-coloured bedside lighting, and [covering / uncovering] the small standby LEDs on household [electricity / electronics] ."