dreamed Downton Abbey ending

I was watching Downton Abbey and gradually falling asleep. Then I watched the last episode in the dream, but I didn't finish it, because I was so tired in the dream, I said to myself, let me just sleep for a while, I could reply the DVD later. 

Everyone died, only Mathew and Sybil alive. Mary died in a river, Mathew tried to carry Mary swam across the river, but he couldn't make it, Mary sunk. Sybil married a black man and had a handful of children, finally she ended up with Mathew. 

I fell asleep in the dream, I woke up in real life.

I always wonder, is dream another life, like Avata? Unfortunately my dream cannot be a series.