In a dream where you realised you were unconscious, and you were able to control the situation, what was the last thing you did? I suspect most people take flight, and I often do that too.
Last time, however, I was in some sort of mashup of both my secondary schools (I moved halfway through Year 9) and university. I decide to simply float down the corridors in the foetal position, à la Gravity.
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They are either sexual or very violent, or things that I deeply fear such as being kidnapped/suffocated, or bleeding out.