What does this dream mean that I had?

I dreamed I was running from millions of people dressed in black sheets that had flame throwers than I went in a puddle and fell in. I swam down down down and down. I than was in a swimming pool, swimming. Than I saw a black sheet man come from nowhere and say "I will make you think it is a dream" And I woke up. I am really confuesed. Was it a dream? Or did he make me think it was.