Why is it so hard to kill people in dreams?

[AR47]

If I dream that I have to kill someone or something, then I have put a lot of effort into doing it. Basically I could stab it or beat it so much that it would certainly neutralize any human or animal, yet they just keep going. Of course eventually they do die or run away but it takes WAY more violence than IRL. What causes this?

Btw in all of those dreams I'm acting in self defense.

 

[Swarthy]

Because it's a dream and you don't need to because it's not real