The+earth+so+dark

I think that "the earth so dark" is the poet talking about what will happen once it has become another child. Another meaning this might have is about re-incarnation. Re-incarnation is when someone or something dies, its soul will be moved on into another body. I think that "The earth so dark ; so long my sleep, I have become another child. " could be talking about before the soul is placed into another body and in waiting.