What Am I Riddles

Question: At night they come without being fetched, and by day they are lost without being stolen.

What are they?

Question: What demands an answer, but asks no question?

Question: What is one in every doll, in every doll, in every doll?

Question: What is it that no man wants, but no man wants to lose?

Question: I'm heavy but not backwards.

What am I?