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.
Did you forget about your teenage years? Teenagers want their own space to hide their uhhh stuff.
There are beds with drawers underneath.
Classic monster hiding spot! Won’t work!
It slows it down though, it’s futile but it’s reassuring.