The dream (as I remember it ) began with myself lying in my bed. I then feel a sharp blade pierce my back (I sleep on my stomach) but since I'm in a dream I don't feel any pain and do not die. A person to my left who I never got good look at told me that the attackers were Predators and thought I was dead  so if I wanted to live I should stay still. 
 
Then the dream cut to me running through my house seeing glimpses of cloaked figures and I felt a sense of dread as if I was going to be killed. I came to a door that lead outside but didn't go through because dream logic told me that if I left the house I would be killed even quicker.  I then found myself hidden in a closet with what I assumed to be a Predator on the other side, pulling at the door to get it open. I lost the battle and the door flung open to reveal a human who was there to warn me that I had been called to the Predator home world to participate in their games. In order to transport myself to their homeworld I had to drink the blood of a person who was called before me and survived and drink a vile of their blood. This person just happened to my grandpa. He refused to give me his blood for some reason and I failed to get the blood then I would be hunted on Earth and would be killed. So as you can guess I was kind of freaking out in the dream.
 
Cut to the next "scene" in the dream and I'm in a dump with Angel from the Buffy series. Why? I don't really know why him exactly but he seemed to know where a vile of blood that belonged to by grandpa was hidden. It was in a giant black fridge that was up against a wall. He opened it but then a creature that I can only describe as the Jockey from Left 4 Dead 2 wondered up behind us and jumped on me. Angel instructed me to spit a loogie in it's face and while it's stunned I scream at it for it to die. Doing this made it back off but then it transformed into man in a business suit and again it jumped on me.
 
That's where the dream ended and I woke up confused at what exactly happened. But I guess that's how all dreams are.