Dream, Murder and Kill, what do these 3 words have in common?

What it could be is that you are having nightmares when you are sleeping and you are experiencing a type of deja vue. Which is (if you do not already know) you are in an everyday situation and you feel like you have been there or done it before. You could have dreams where you are experiencing a murder or you see a murder and it freaks you out. You may not remember your dreams but your subconscious does so it seems you see it more then usually because you might also be experiencing it every night.