When observed by a different conscious being, yes. But from the inside observed by oneself, it feels quite similar, besides the fact that sleep is initiated by oneself, and the wakeful state transition for sleep is more gradual than for anesthesia.

I think that distinction matters because strictly speaking, oneself only has access to one's own consciousness, and that defines one's own understanding of the word "consciousness". It's not possible for me to be you after all, and whatever inferences I make about other people being conscious is based on the fact that I experience my consciousness, and you are similar to me in some specific way (such as being, presumably, a human), therefore you must be conscious. Of course, I'm taking a materialist stance here but that's what's practical to talk about anyway.

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munificent 37 minutes ago | parent | next [-]

> But from the inside observed by oneself, it feels quite similar, besides the fact that sleep is initiated by oneself, and the wakeful state transition for sleep is more gradual than for anesthesia.

Have you been anesthetized before? Different forms are very different, but none of them feel like sleep, at all. General anesthesia feels like a time simply skipped forward. Like a chunk of your memory tape was cut out completely. Twilight sedation feels like you temporarily inhabited someone else's body but the experience was so strange that you blocked out almost all of the memory.

Sleeping and dreaming is totally different.

	▲	txrx0000 20 minutes ago \| parent [-]
		I've been under general anesthesia, but it does not feel too different. I'm dead when sleeping, and basically never dream. I should have said "dreamless sleep" in the earlier comment to be more precise because dreaming is obviously different, but it happens so rarely I forget it exists.

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georgemcbay an hour ago | parent | prev [-]

> But from the inside observed by oneself, it feels quite similar

Having been under general anesthesia once the feeling of just completely not existing for the time period I was under felt very different than sleep does to me.

	▲	txrx0000 40 minutes ago \| parent [-]
		Perhaps it's because I almost never dream. Sleep feels almost just as dead to me. Case in point, I think we're probably talking about slightly different phenomena even when we talk about the same linguistic definition of consciousness. Kind of like how my idea of an "apple" is based on all of the apples I've seen in the past and instances where I've used the word or saw it being used by others, whereas your idea of "apple" is based on your experiences. They must be mostly similar in information content or we wouldn't be able to communicate at all, but the self-or-other distinction is important.