What does this dream mean?

I am on a roller coaster and I feel as though the belt is quite loose and I am going to fall out of the car a t any second. Finally, I reach the end. As I get off, I find myself in a cold, dark, cement room. Across the room from me are three wild animals. They are snarling with such ferocity that it petrified me. They are coming closer and closer, visions of my mangled body already start to fill my head. I know it is a dream, I know it... But I cannot seem to open my eyes. Please! Wake up! I screamed and started to cry as one of the abnormally large beasts lunges at my throat and I felt as though I could not move from fear. Suddenly, I wake up right before I am killed.