I know what you mean, I had the same feeling last night. It was like, you could feel it itching, but then you feel Sleep Paralysis take over, and I could feel a blanket of numbness slowly stretching over my whole body,and it felt awesome.

oh, and btw, it is ok (when trying to wild) to move a little bit, swallow, blink, scratch an itch, etc, as long as YOU DON'T think about it. If you subconsciously scratch an itch, it's ok, it's natural.