but sitting at a computer usually (although not always) means some productivity. might not be production on the right product, but progress none the less.
i think pure procrastinators would have to sit in padded rooms and do nothing but sleep, making sure not to dream of anything.
But it seems like effort would be put forth into not dreaming of anything. Maybe, they just sit and passout and puting no effort into anything needed effort. So, they would passout, because some effort could be used to fall asleep.