I had something sort of like this happen by accident.
It is no secret that it is dark a lot in Alaska in the wintertime. Well I shoot into my garage while standing in the road. This winter I was doing this in the dark, with a work light in the garage shining on the target.
Standing in the dark, I could not see my arrow or bow hand, and had to just focus on the target. Like you I was impressed with how good I was shooting without the distraction of trying to second guess my instinctual aim.