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Many people find it difficult to fall asleep in a brightly lit room.
This is because bright light suppresses the secretion of melatonin, a hormone that promotes natural sleep.
Melatonin not only induces sleep but is also believed to have antioxidant effects, promote cell regeneration, relieve fatigue, and help prevent illness and aging.
In other words, melatonin is essential for achieving high-quality sleep.

So, how much light is acceptable without suppressing melatonin production? Here’s what the research suggests:
The ideal brightness is similar to sleeping under moonlight, which is about 0.2 to 1 lux.
In reality, even a small night light often emits around 9 lux,
so it's best to place the night light lower to the ground or use it as indirect lighting rather than lighting up the entire room.

Sleeping in complete darkness is also perfectly fine.
However, if total darkness makes you feel even slightly anxious, that tension may reduce sleep quality.
So, as long as you feel safe and calm, there’s no problem with a completely dark room.