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.
I’m really scared of my shoddy workmanship (or an earthquake, bad dream, etc) causing the shelf and any heavy items on it to come crashing down on me in the night.