We've told you that too little sleep raises the chance of obesity. Now, for the first time, there's a link between sleeping with artificial light at night and weight gain.
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Using data from the nationwide Sisters Study, which predominantly examines breast cancer, federal scientists found that over 5 years, women sleeping with a light or the TV on were 17% more likely to have gained 10 pounds.
Outside light from outside the bedroom had a smaller link.
Study leaders suspect the light hampers the body clock and the sleep hormone melatonin.
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They note that for many who live in urban environments, light at night is more common and should be considered.
They also add that humans are genetically set for a world on sunlight during the day and darkness at night.