It’s not unusual for children to be afraid of the dark.
I would say its quite common for parents to leave doors ajar or buy night lights to help their children sleep soundly.
But how come there aren’t more adults afraid of the dark?
How come adults don’t need a night light?
Because the fear of uncertainty is removed with experience.
With practice you learn that turning off the light isn’t fatal. That just because you can’t see doesn’t mean the room has filled with monsters.
Just because you are surrounded by the unknown doesn’t mean you can’t get a good nights sleep.
Thomas Duggan 