I don't really know much about short drop hanging, but of course many people have succeeded with hanging in general, it is one of the most common and easily accessible ctb methods. It does sound difficult to me though and complicated and I would fear it going wrong in someway which is why I have never attempted.
I have never heard of anyone succeeding with the Night Night, it sounds unreliable and I read about a failed attempt with that method once.
I really wish that dying was easier, it is so unfair how it is hard to leave. I think that if I knew how to be successful with these methods, I would already be gone.