I haven't read all of this thread, so I can't be sure what's been said (about nod bread...? attempt at rhyme), but...
Oohhhhhhhhhhh nodding. It's a blissful state of drifting in and out of sleep, between a dream world and the real world, all with a positive glow, an orgasmic body buzz. Sometimes you'll drift in and out of sleep not knowing it, sitting in one place for 10 minutes, but you'll swear you were just talking with your buddy Scott about carburetors because you just vividly daydreamed it. Yet at the same time, it's a blur; both the real world and opiate-induced dream world. The whole experience of the nod is essentially that of being between wake and sleep, being nearly on the border between life and death. It's a fascinating and wonderful feeling, but can be extraordinarily addictive because of the amazing comfort and ability to drop out of the world that it provides. The experience is such that some waste 30, 40, even 50 years nodding out half the time or more. That's no way to live, it's a way to to die in the flesh. But a nod is something everyone should try once. It's almost psychedelic in a way, except without visuals and with extreme uncontrollable moaning, drooling, eyes rolling, passing in and out of sleep, and bodygasms. Hope that sums it up, I've almost got myself fiendin', and I'm kicking the habit.
EDIT: Though no amount of words can really sum up a nod, it does have a definite kind of dissociative element to it, in that it allows you to leave everything behind and drift off doing nothing but writing in pleasing and going in and out of sleep for several hours.