I've heard as well that smoking marijuana excessively and regularly has some sort of blocking effect on dreaming .
Or is it the other way around ?
Something like that .
Discussion
People who smoke, usually don't remember dreams.
I know I dream always, but not always remember. Is fases. Sometimes I remember during day, when something happens, or someone speaks something that makes me remember part of the dream.
Sometimes I have what I think is called sleep apnea. In my teens was more frequent.