Wow. I didn’t know this, but I was actually able to observe this state on myself. When going to sleep, my mind is wandering. But at one point it drifts from real world thoughts to completely abstract concepts and wild imagination that sometimes makes no sense. It’s almost like a hallucination. What’s most interesting is that sometimes I am able to notice the transition to this state and consciously observe it. Usually it makes me happy because I know I’m about to fall asleep within the next few seconds (which I often have problem with, writing this comment at 1:26am again..). I am also able to consciously observe the images being generated. It’s very weird, because it feels like one brain looking into someone else’s brain to the extent that is impossible by any technology or in any other way. Sometimes I’m able to consciously wake up from this state, because I have weird “sleep phobias”. Sometimes I am fascinated by the idea generated at that stage. But unless I write them down or really get up, they are typically lost if I fall asleep within next 5 minutes - maybe I’d have a Nobel prize already, if only I kept a pen and paper ready next to my bed. Or apartment full of crappy kitch paintings..