Yeah, it's really strange to me. I find it similar to an OBE and A lucid dream/FA mixed together. (people will argue they are the same thing, but I disagree) It kind of feels like I started to lucid dream then went into SP, the vibrations lightheadedness were similar to the first few seconds of SP for me. I would like to explore these kinds of FAs or OBEs more, because they are sorta pleasant.

I actually googles UILD after I posted my reply because I think I have read it somewhere before, anyways, apparently some people actually use it. It makes sense because it actually makes you get up, I can't go to sleep if I have a full bladder. We all know its tempting to hit the snooze button, or off button on your alarm... Although this also seems a little hard to time your awakening.