'Orichi thinkers continue to argue about them. Are you happy if you aren't conscious of being happy? What is consciousness? Is consciousness the great boon we consider it? Which is better off, a lizard basking in the sun or a philosopher? Better off in what way and for what? There have been lizards far longer than there have been philosophers. Lizards do not bathe, do not bury their dead, and do not perform scientific experiments. There have been many more lizards than philosophers. Are lizards, then, a more successful species than philosophers? Does God love lizards better than he loves philosophers?
However one may decide such questions, observation of the asomnics, or of lizards, seems to indicate that consciousness is not necessary to living a contented sentient life. Indeed, when carried to such an extreme as human beings have carried it, consciousness may prevent true contentment: the worm in the apple of Happiness. Does consciousness of being interfere with being—pervert, stunt, cripple it? It seems that every mystical practice on every plane seeks precisely to escape from consciousness. If Nirvana is the mind freed of itself, allowed to rejoin the body in the body's pure oneness with its world or god, have not the asomnics achieved Nirvana?
Certainly consciousness comes at a high cost. The price of it, evidently, is the third of our lives we spend blind, deaf, dumb, helpless, and mindless—asleep. We do, however, dream.
...
As on our plane, only certain animals, including birds, dogs, cats, horses, apes, and humans, regularly enter the peculiar and highly specific brain-body condition known as sleep. Once there, and only there, some of them enter the even more peculiar state or activity, characterised by highly specific brainwave types and frequencies, called dreaming.
The asomnics lack these states of being. Their brains do not do this. They are like reptiles, who chill down into inertia but do not sleep.
A Hy Brisalian philosopher, To Had, elaborates these paradoxes: To be a self, one must also be nothing. To know oneself, one must be able to know nothing. The asomnics know the world continuously and immediately, with no empty time, no room for selfhood. Having no dreams, they tell no stories and so have no use for language. Without language, they have no lies. Thus they have no future. They live here, now, perfectly in touch. They live in pure fact. But they can't live in truth, because the way to truth, says the philosopher, is through lies and dreams.'
- from 'Wake Island',
in Changing Planes, Ursula le Guin