Why can't I just have normal dreams?

I had a pretty messed up dream this afternoon. I can't remember most of it (I jotted down the main points, just haven't got back to it) but at the end, I end up in a park. In this park, I come across a scene of death. The bodies of 4 out of 5 members of Arise & Ruin are laying in front of me. I scream " NOOOOOOOOOOOOOO!!!!!!!" (Usually, I would wake up groaning at this point) Then I hear this high-pitched wail.scream. It sounded like Travis from Cattle Decapitation. When I find the source, it's Ryan, the lone surviving member of Arise & Ruin clinging to the bottom of the park. Apparently now the park is floating in the air. The scene was similar to Luke hanging from the antenna underneath Cloud City.  I woke up at this point. Nature called, I wrote down some key points and got back in bed. I tried to get back into the same dream but it didn't happen. I'm interested to look at my notes later and try and remember the rest of it.