Yes, in fact I meant to say "deep sleep" or as you say REM sleep. If I'm not mistaken, that's where dreaming happens, which is a way for the brain to rest, repair, and reorganize itself. if the brain doesn't get a chance to do that, confusion is the result, and the more deep sleep you lose, the nuttier you feel. As I mentioned in my first post, when I finally got relief from my pain, I slept 36 hours, filled with dreaming and hallucinations (deep sleep).