Exposure to blue light for a long time may also cause discomfort such as eye fatigue, blurred vision, and dry eyes. Headache and disorientation may be experienced. It has been observed that prostate cancer in men and breast cancer in women are more common in cities where artificial lighting is used more. The bad kind of blue light can even disrupt the hormonal balance in our body. Sleep disturbance is one of the harms of blue light. As we mentioned in our how to fix sleep schedule post, looking at blue light especially at night reduces melatonin hormone secretion and disrupts our sleep pattern.