I don't experience the SP anymore but I do get HI. I just let the HI happen and watch as it forms more complex shapes. It eventually shifts into an entire dream scene, I'd wait for a few more moments and then try to do something in the scene. If my body is deeply enough asleep I'll have stepped right into a lucid dream.

I usually sleep on my side or stomach when I WILD. I've had my more vivid and controllable WILDs while sleeping on my stomach.

Don't know if any of that will help but hope it does.