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Sleeping with a cellphone, bright alarm clock on or a television next to your bed puts women at risk for weight gain, a new study found. Women who slept with a light or even the TV on were 17% more likely to have gained 11 pounds over the course of five years, according to the study, the results of which were published Monday in the medical journal JAMA Internal Medicine. Light coming in from outside the room was associated with more modest weight gain, researchers found. The study is the first to find an association between exposure to artificial light at night while sleeping and weight gain in women, according to the National Institutes of Health (NIH), which funded the study.