How can people sleep in total darkness?

If i dont have any light when i get up to use the bathroom id trip over something lol does that not happen to yall?

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I have night lights all over the place. Two in my bedroom -- 3 if you count the one in my bathroom. Two in the kitchen, one at the top of the stairs, etc. Can't do total darkness, unless there's a blackout--well then I'd light a candle, so...