So to answer your questions, Past life memories can appear in dreams all the time, they are usually karmic in nature because it’s something that we are working on clearing. Dreams are very subconscious territory so it’s all about symbolism and inner issues be they fears, past lives, messages, people from our past, precognition, etc. So yes past lives can very easily appear in your dreams. I was also contemplating that there has to be a connection between our long term memory and our dreams because they’re both made of the subconscious.
Also because we are in the Shadow of Mercury we are most-definitely feeling the past especially in others right now. IT’s kinda eerie in some ways because this is basically showing us that time is different now. So our consciousness is linking past, present and future selves simultaneously so it’s like we’re ‘all versions of ourselves. If that makes sense? It’s basically like imaging yourself as an onion, past self, future self and present self all wrapped up in one. Your past self is coming to the forefront, meaning all those murky issues you never dealt with are manifesting into your awareness, because our past is colliding to our present so we can start creating our new Future 😀 It’s actually a really beautiful thing. It means we’re truly evolving 🙂
If you want to read more on mercury retrograde: http://darkstarastrology.com/mercury-retrograde/
I hope this helps <3
Thanks for the question