Aside from the Marquis's excellent answer, you could also turn to the large literature within the scientific community on the physiology of dreaming. Yes, this literature is very different from the sources in your library (at least, those you have listed here), especially in that they are scientific. I am certain you will not read any of it (please, please prove me wrong), but you should be aware that dreaming, while still a fertile area for research, is not nearly the dark continent you suppose that it is.Iacchus said:Here are a couple of interesting dreams in case you're interested (#'s 11-19) ... Perhaps you can explain to me why they seemed so real?
If you are seriously interested in dreams, there is a serious literature on them. If, on the other hand, you merely wish to confirm your preconceived notions of dreaming (like that ludicrous notion of dreams as "receiving signals" from some other existence), please re-adjust your blinders and proceed as you were.
If you persist. However, are you suggesting that one's mental state does not come into question when they begin to hallucinate (have visions) and hear voices?