What Am I Riddles

Question: I hide when you wake but upset you as you sleep... What am I?

Question: Silent yet deafening. Invisible, but you know it's there. It can either make you laugh or it can make you cry. What is it?

Question: I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me; lower light I never see.

What am I?

Question: What's made of wood but can't be sawed?

Question: You see us everyday, but you never see us together. We appear everywhere but never are we together at the same place. Who are we?