Is it wrong for me to hear someone?

I've got somthin to ask and i hope someone knows the answer:Is it normal to hear voices (not normal but is it just somthin some people do) and second is it normal to like hear screams in your sleep not just like bad dreams but just people screaming and like horible screams like so bad that it makes you not want to go to sleep at night (yet again not normal like every one but like just some people do it).