these are some really distrubing images and the ont hat stands out for me is the THE PESADILLA by Johann Heinrich Füssli while it may not be the most gruesome it triggers a story a friend told me years ago of waking up and not being able to move as if a demon was sitting on her chest and all she could do was pray and hope that it would eventually stop
That story still sticks with me to this day
Yes, the painting The Nightmare has that characteristic: although it is not the most frightening, the one who has had the experience of feeling the weight on his body while he sleeps, cannot help but shudder. Thank you for your comment , @chekohler.