Well when my rabf was using h. He would literally nod off just sitting, talking, eating, etc. not because he was tired, my god he just slept half the day away! he nodded off because his body just couldn't handle what he was doing. I guess his body felted "well if i can knock him out. i might have a chance to recover from all this abuse he is doing." I often thought about his poor body and brain when he was actively using. the body can do amazing things when it has too, no?
peace