I wouldn't know... I have aphantasia and sometimes I'm not even convinced that I even dream (I'm being facetious but at the same time I'm really not). Many others with aphantasia report similarly that they do not have recollections of their dreams.

I think that I know that I dream, deep down, because of things that former roommates and my wife have told me, but... I am trusting them at their word. And I know they're not lying to me, because why would they, but... I don't know it myself because I haven't experienced it.