I suppose I'm lucky because unlike some people with aphantasia I think I have pretty visual dreams. Occasionally I wake up right in the middle of a dream and know that I was experiencing some fairly vivid image, but it's pretty rare. I can't remember my dreams though. Sometimes I can convert the last few minutes into a description I tell myself but without much detail. Being unable to see images or experience other senses in my head it just becomes a jumble of almost meaningless words without connection to anything. Like eavesdropping on a stranger trying to explain a dream that's rapidly fading.
It's really painful actually. I think that the only time I ever feel OK is when I'm in the dream world, but every time I wake up I am forced forget that happiness. Leaving only a lingering sorrow I can't quite describe. >>878
I can't speak to anyone else's experience but hallucinogens don't work for me. It seems that they don't actually cause hallucinations, but just free a person's imagination to wander. Not having an imagination only my thoughts and senses get messed up, and things get a bit wiggly and colorful but that's about it.
I've also tried Galantimine, melatonin, histamines and a few other drugs rumored to be "oneirogens". They definitely do seem to help with being in the right sleep stage to remember dreams and some maybe make them more vivid.