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A good (cool and dark) night time environment is vital for hormone health, yet we often put lights in kids’ rooms. Many parents became alarmed about night-lights and vision problems after an American study in 1999 found a link between night-light use for children under two and the development of myopia. But not only have the authors of that study since backed away from their findings. Many children sleep with night-lights in their rooms. They can be a source of comfort for toddlers and older children who are afraid of the dark or scared of monsters (not to mention convenient for parents who don't want to stumble around in the dark).
Even so, night-lights aren't necessary for young toddlers. That's because children don't experience night time anxiety until they are two or three years old, when their cognitive development enables them to understand the concept of fear and they're capable of imagining scary things lurking in the dark. In the meantime, your toddler will sleep better in a dark room.
So, my opinion is that if your child is old enough to fear the dark, however, use a night-light that provides enough light for comfort but doesn't illuminate the room too much. If your child insists on a bright light, install a dimmer switch and progressively dim the light over a number of nights. but sometimes night lights creates many problems for kids like that Night time light exposure can decrease sleep quality, but it can also shorten the duration of sleep, leading to further problem.
Please let me know if you need any clarification. I'm always happy to answer your questions.
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