Short hard mystery riddles

I am covered in feathers or foam, yet I have no wings and cannot fly. I am the only place where you can lose and find your mind at the same time.

If I have it, I don't share it. If I share it, I don't have it. What is it?

There was a plane crash every single person died. Who survived?

Where can you find rivers with no water, cities with no buildings and forests with no trees?

I visit you every night even if you don't call me. I'm lost every day. What Am I?

Everyone has me but nobody can lose me. What am I?

Imagine you're in a room that is filling with water. There are no windows or doors. How do you get out?

I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?