Eh, I used to date a girl who had recurring dreams where she killed and dismembered people with a knife, then played with the organs. And despite the graphic nature of those dreams, she never had those dreams translate into real life murders. At least, as far as I am aware.
So just relax and take this as what it is - just some dreams. Your subconscious may be a homicidal maniac, but as long as that doesn't spill over to your waking mind, there's no harm in a little dreaming.
If you start having recurring fantasies about murdering while awake, then maybe its time to talk to a professional.