It's all about dimmensionality. We live in the 4th dimension, time actually being the 4th dimension that we move through based upon our choices at any given moment. These Reptillians, Archons, Annunaki, etc. are in fact beings that move through higher dimensions than we are able too, and can observe our reality, but can not fully interact due to the nature of their existence. They do not posses a 4th dimensional physical body like us. This brings us to the nature of our core essence, or soul, which seem to inhabit our bodies. Our soul exists in the higher dimensions but inhabits the 4th dimension via the body. Our soul is simultaneously interacting with the higher realms and lower realms, and effect both. This ties into the collective consciousness that we all seem to be tuned into. That same phenomena is what these creatures feed off of, our negative emotions that reverberate into the higher realms. I'm not sure how much sense that made, as it's an abstract theory I've been working through mentally, and have some trouble expressing in my given language construct.