I’m not a parent, but going by pop culture, it seems like literally every child has the same fears.
In pre-modern times, I imagine that they’d be sleeping in the same room as the parents, but if modern notions of privacy don’t permit that, seems we could at least design an enclosed capsule or something.
Eliminate closets?
Anyway no, not every child has these fears. Mine don’t. They sleep in pitch darkness and have never complained.
But you deal with a lot of weird fears and hang ups with kids. Not by accommodating them but by helping the kid grow out of them.