Greetings Silva,
Welcome!
There are different types of 'dreams.'
I don't mean to be evasive, but it's true. Anything that happens consciously while we're sleeping we call a dream, but the causes of them and where they come from are not alike.
I don't know all the different types but some are
==rehashing the previous day's events and worries
==recalling situations from earlier in this life; characters may have changed though
==seeing 'plays' with actors in roles that have meaning for you
==receiving information from an unconscious or a subconscious source; it is information that is needed for a person's development.
Go over to the Dream Forum on this site and read some of those discussions if you want to know about dreams that have spiritual meaning. We are concerned here with dreams that come to people who have chosen to meditate to clear their minds of most types of dreams and are interested in contacting their Higher Selves. These dreams will be very vivid and unforgettable--they seem to be the most important to understand.
best wishes, Bets