What Am I Riddles

Question: Only one color, but not one size, Stuck at the bottom, yet easily flies, Present in sun, but not in rain, Doing no harm, and feeling no pain. What am I?

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?