Although I'm sure a grossly toxic body reacts differently, I have not noticed major differences in dreams since being vegetarian 2 yrs. Subtle ones of content perhaps but not much change in memory ability. Memory recall seems to be a function of wanting... really wanting to recall and also eagerly face the problems your higher self will reveal unencumbered by the ego. There are things we just put off facing in our daily lives. This procrastination and defense mechanism takes over and thinks and tells us what is important and what to remember. The more yearning you have the more you ask the more you discover the more you open up and receive.