I very often dream of being in very big houses etc, It can be places with 3-5 floors and each room is very big. But why do I dream of this all the time? I almost never visit big places with many floors, my school has 3 floors that I walk up every day but apart from that I don't know. And in these dream I always find my family/cousins/school mates/random friends being in some of the rooms, when I walk around and visit each room I can see one of the listed people being there.

How would I make reality checks when I never am in those big places?