IT MEANS BOY YOU ARE IN NEED OF SOME REAL PROFESSIONAL HELP
Your a sick bastard
It seem you may of been upset with your sister before you went to sleep just because you had a dream like that it does not make you a bad person.
You can do things in a dream that you can't in real life. I can fly and often have super strength. You tear your sister apart. Bet it doesn't kill her though or even really hurt her.
Your brain is angry and frustrated with your sister. It is trying to resolve some of that frustration. That's all.
you watch too much Criminal Minds
It means that you were unconsciously or consciously for that matter thinking about doing it before you fell asleep. In my studies I read so many case studies like this and most of them that followed through with murder had overwhelming deep regrets years down the line. It's sad all around!
instade of leting out all the emotiones take over u in ur sleep why don't u try to think about ur problems while u are awake that i think comes out from ahuge hate for her u should ask urself why u hate her that much what had she did to u and try to block emotiones and think with ur brain and then u will find the answers and what u should do about it
it means we have the same sister.
Looks as if we have some unresolved sibling rivalry issues here.