If you are dreaming that you are dreaming, then it is very common dream, which shows that you are worrying too much about something and do not let your brain to rest completely during the sleep. It also shows that you are not fully asleep and you are in wide-awake dreaming, where you are not fully asleep and some part of your brain is still not sleeping. The main reason for these kind of dreams is the stress you are unable to get rid of in your wakening life.
Dreams dream meaning
Read more about dreaming of Dreams in other dream meanings interpretations.