I do believe in reincarnation so I think it may be possible for someone to unconsciously remember bits and pieces of a past life in a dream. Of course, no one will ever be able to prove or disprove this, but I like to think it could be true.

Personally, I've never had a past life experience relived in a dream (or maybe I just didn't realize it for what it was).

Regardless, it's an interesting concept to think deeply about.