I tried that mind awake/body asleep strategy. Well I got partial sleep paralysis with it, but I couldn't get out of my body, probably because I couldn't hold on to total paralysis for longer than a few seconds. I tried sinking through the bed, visualizing myself in a different scene, breathing with my mouth open, but none of these worked. Then I saw in some book table of contents that I need to be in some trance state and they had different exit methods I've never heard of. Clearly I need to read up more.
One weird thing in sleep paralysis, I had some intense pains like my feet and legs were on fire. When a wave of gravity + tingles went over me I was reminded of the coming on effects of Salvia.