Answer:
Not born, but from a Mother's body drawn. I hang until half of me is gone. I sleep in a cave until I grow old. Then valued for my hardened gold.
When the day after tomorrow is yesterday. Today will be as far from Wednesday. As today was from Wednesday. When the day before yesterday was tomorrow. What is the day after this day?
I am nothing but holes tied to holes, yet am strong as iron.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
My first is a body of water. My second is me. My third came before. My fourth before all three. My fifth sounds like my first. My sixth is in a lake. Put all six together to make an animal that will keep you awake.
I stay where I am when I go off. What am I?