Well the dreams where you are being attacked but can't get away probably has to do with you wanting to avoid something but your unconscious trying to tell you that you can't avoid it; you have to face it and deal with it.
The person who is attacking you may be a part of yourself that you don't want to face.
The Superman dream could be about something that is preventing you from reaching a goal. This could be related to the other dream. Your not accepting something about yourself could be preventing you from achieving success at something.
You might want to read about
Chase Dreams and
Flying Dreams.