Good Inside treats fear, separation anxiety, and sleep disruption as problems of safety carried in the body. The child does not only need reassurance that the adult exists; the child needs to internalize enough of the adult’s soothing presence to remain safe in that adult’s absence.
That is why many sleep struggles are not really bedtime technique problems. They are attachment and transition problems showing up at night.
The ministry parallel is obvious: children and visitors alike can only receive a place as safe when they can borrow enough calm from the environment to stay there.