Good Riddles

Question: I can fly in your mind. I was not made to scare anyone, but many fear me. What am I?

Question: A man in a wheelchair is being pushed across a hallway by his wife. When they get to the end of the hallway the man says: stop pushing me. His wife asks why, and the man gets up and starts walking. How did the man get up and start walking if he was in a wheelchair?

Question: What can you touch but not see?

Question: While you're asleep You are also Awake, While you are Awake you're also asleep. What is it?

Question: In the books of a famous writter, How many letter in Those Books?