Silent Lucidity

Last night as I entered that lucid sleep state where I was not quite sound asleep, but on the verge, I awoke myself by screaming and sitting up really fast. My immediate response was to turn toward my pillow because I could see a whitish mass passing over my pillow from the side. I tried to focus my eyes as there appeared to be quite a blur from this that I could not tell what I was seeing. I was really frightened by this as it felt like an entity had laid down beside me in bed and had it's head on my pillow which is why I woke up feeling the presence. I was not dreaming at all at this point and therefore was not frightened by a dream. It was the presence that alarmed me. And it almost felt as though it took my breath away for a moment. It quickly dissipated once I shook it off, like it was touching me. I laid back down and went to sleep with no other such occurrences and slept fine throughout the night with no fear. I think I was just startled by this, but had no fear afterwards which would lead me to think that the presence did not mean harm though I can't be sure.