Sleeping with a night light on may not be so healthy

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I cannot get any sleep if it isn't pitch black and dead quite. But my mom always sleeps with a night light on and cannot sleep otherwise. She says its not healthy to sleep in total darkness. According to certain researches, they advice not to sleep with a light on. http://news.bbc.co.uk/1/hi/health/342256.htm But there were other sites contradicting the statement that night lights lead to myopia. I didnt know these facts till recently. Do you sleep with a night light on?