Answer:
I am the book one can never finish reading
I'm simple for a few people, but hard for them to hear. I live inside of secrets and bring people's worst fears. What am I?
What two things can you never eat for breakfast?
The more you have me, the less you see. Shine a light on me and I flee. What am I?
I run up and down the stairs without moving
Why is the letter B always cool?