Dreams within dreams are kind of tricky, as it depends on whether you're within multiple levels of dreaming or simply repeatedly experiencing false wakings. Levels are denoted by actually dreaming that you are going to sleep before the second dream begins, as opposed to dreaming that you wake up. It seems you have been having the "false waking" version.

False wakings, regardless of how often they occur within the dream, are simply your body remaining in sleep while your mind tries to wake...and fails. You're getting stuck in Theta wave activity, and as you approach the Alpha waves of consciousness, your brain falls back into a Theta cycle, pushing you back into dreaming.