About small light & how it can affect?

I've heard several times theories about small amounts of light being harmful. For example, nightlights causing nearsightedness & more importantly women sleeping in direct view of a small amount of light at greater risk of breast cancer? IF you've heard of this & know more, please let me know if it affects through the brain & then sending a signal or if it only affects when that area is exposed. Thanks so much.

It isnt true

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　　Neuroblastoma 　　Nerve Diseases 　　Nephritis 　　Neoplasms 　　Neck Disorders 　　Neck Injuries 　　Nearsightedness 　　Nasal Cancer 　　Narcotics 　　Narcolepsy 　　Nail Diseases 　　Myositis

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