Erm...sleepwalking is a state of malfunction in normal sleeping time paralysis. If you sleepwalk a lot the only thing it proves that your brains just don't work the way they are supposed to when it happens.

Sleep paralysis is a state which can be accompanied by hypnagogic hallucinations. This is usually regarded to explain most - if not all - of the paranormal labeled phenomena in cases where people have woke up before the experience.

Sleep paralysis is the most commonly found reason to explain the classic demonic visitations and what nowadays more commonly manifests as experiences of abductions. I know this probably isn't anything new to most of you but I just brought it up to highlight the fact that there's nothing in your description that would contradict with the reality of this condition. Then again I'm not here to belittle your experience nor am I debunking the possibility of something "paranormal" in some cases, either.