A little boy came downstairs crying late one night. What's wrong?

A little boy came downstairs crying late one night.
"What's wrong?
" asked his mother.
"Do people really come from dust, like they said in church?
" he sobbed.
"In a way they do," said his mother.
"And when they die so they turn back to dust?
" "Yes, they do." The little boy began to cry again.
"Well, under my bed there's someone either coming or going."