fun fact, carrying over my teenage days on 420chan forever the fuarrrk ago:
dph is a powerful deliriant in high doses - ie 300mgs plus. And by deliriant, i mean, having conversations with people and things that aren't there, legitimate hallucinations, rip legs. I used to take it when I was curious about seeing if I could replicate symptoms of schizophrenia.
afaik, you dream every night, even if you're not conscious of those dreams upon waking. i'd suggest looking into a more conscious approach to dreaming, ie, attempting to invoke lucid dreaming while simultaneously keeping a dream journal. (that last suggestion is powerful stuff; it really works.)