Health professionals often warn that late night cell phone usage can keep you awake, but a new study found a more alarming reason to give up browsing the internet in bed: prostate cancer. Everyday devices like cell phones, computer screens, and even street lamps emit blue light, which research shows disrupts our circadian rhythms and confuses the body about when it’s time for sleep. There's been emerging evidence that this could increase people's cancer risk — and now, a study published in the journal Environmental Health Perspectives reveals that blue light exposure could double a man's risk of prostate cancer or increase a woman's chances of developing breast cancer by 1.5 times.To determine whether that evening glow could be dangerous, European researchers led by the Barcelona Institute for Global Health compiled data from more than 4,000 people. Participants included those with and without breast and prostate cancers between the ages of 20 and 85.
