What Am I Riddles

Question: I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes. What am I?

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

What are they?

Question: I can be cracked, I can be made. I can be told, I can be played.

What am I?

Question: When you fall in me your as happy as could be, but you fall into depression when you lose me.

What am I?

Question: The person who buys me doesn't need me, the person who makes me doesn't want me, and the person who uses me can't appreciate me.

What am I?