Anyways, to answer your question, or statement rather, laurenchild, it seems to me like you had experiences of sleep paralysis, which not only is normal (at least 80% of the entire population will experience it at least once in their life-time), but also entirely not dangerous. Of course, given your explanation it's hard to tell ig it was sleep paralisys, but I think it might've been. You shouldn't be afraid of it in any case.