It happens frequently, and usually I am driving (in the dream) and get very worried as my eyes start closing and I begin nodding off...
One time, I took 8-10ml of GBL before going to sleep, and I fell asleep before it kicked in. I then had a dream where i was sitting in my car, struggling to breath and unable to move. It was pretty frightening because I had actually taken too much GBL and what I was feeling was real (albeit dramatized by the dream)...
I've always wondered what it would be like to take a capsule of say 50-80mg of d-methamphetamine right before going to sleep (perhaps inducing sleep with a short acting sedative), and seeing if it produces strange dreams. I have some desoxyn, but I wouldnt want to deal with the comedown, nor do I take recreational drugs anymore. They are immediate release; some sort of delay mechanism would be needed so it kicks in during deep sleep. I bet you wouldn't necessarily wake up immediately...
What made you think that this topic was advanced? Certain people seem believe that their questions are for some reason more advanced/thought-provoking than others....