Interesting, I have aphantasia and yet I have both hypnogogic and hypnopompic hallucinations on occasion. Other than those I never remember dreaming, although I almost always wake up thinking of the same thing I went to sleep thinking of. And when I do have waking dreams / hallucinations it’s always of whatever I was thinking about. If I realise the hallucinations aren’t real they immediately fall apart which is a shame, as I don’t normally get to experience any kind of mental imagery.