Nightmare

I had a nightmare. Simple as that. A bad dream. A scary one. I can't elaborate a lot here coz I tend to forget my dreams when I wake up. I can't recall the full story. But I was in a mansion. A haunted one. With corpse. With ghosts. I nearly died. Haven't had such dremas for a long time. People say dreams are reflections of what you think during the day. What does this means to me?