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Consciousness is often said to disappear in deep, dreamless sleep. We argue that this assumption is oversimplified. Unless dreamless sleep is defined as unconscious from the outset there are good empirical and theoretical reasons for saying that a range of different types of sleep experience, some of which are distinct from dreaming, can occur in all stages of sleep.

Pubmed Articles

Does Consciousness Disappear in Dreamless Sleep?

Sciencealert Article We Were Wrong About Consciousness Disappearing in Dreamless Sleep, Say Scientists

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[–] 204 points 2 years ago (11 children)

Sleep is NOTHING like death. You're still experiencing lots of stuff, you still very much have a sense of self, you're still thinking things, your brain is still processing lots of information.

General anesthesia - now THAT is a real close period to what being dead is.

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  • [–] 75 points 2 years ago (10 children)

    I've had general anesthesia, it was just like falling into a deep, dreamless sleep.

    If death is like that, then there's absolutely nothing to be afraid of.

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  • [–] 14 points 2 years ago* (2 children)

    Except the agonizing pain which precedes death

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  • [–] 10 points 2 years ago (3 children)

    I’ve had general anesthesia, it was just like falling into a deep, dreamless sleep.

    What if anesthesia actually just blocks your memories and physical reactions, but you actually experience everything that happens to you in absolute terror?

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  • [–] 13 points 2 years ago*

    What if anesthesia actually just blocks your memories and physical reactions, but you actually experience everything that happens to you in absolute terror?

    Latest studies with FMRIs and other tools have found that general anesthesia decouples the sections of the brain from each other. All the various parts of the brain stop communicating. It's an entities different state than sleep based on the brain activity.

    Normally when we have various stimuli or are asleep, neural activity "flows" around from one section to the other. When under general anesthesia those flows are isolated and don't connect to other sections of the brain.

    This has actually given us a huge clue as to where consciousness comes from and what makes it a thing.

    It also helps explain why going under is just lights out and no drama or anything. It's like an off switch for the "person".

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  • [–] 7 points 2 years ago (1 child)

    I'm genuinely surprised that the idea that something bad might happen to you when you're dead or that it could be painful etc is anywhere near as prevalent as it is. To me, that makes absolutely no sense. Of course dying might be painful... But death? Once you brain no longer works? Feels obvious to me that you won't feel, well, anything. The thing that frightens me about death wouldn't be the experience of being dead, but rather not being able to do any more things and not existing anymore.

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    [–] 62 points 2 years ago (1 child)

    There's still brain activity in sleep.

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  • [–] 33 points 2 years ago (2 children)

    Brain activity isnt nessecarily consciousness.

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  • [–] 42 points 2 years ago (9 children)

    Do you really have dreamless sleep or do you simply not remember the dream?

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  • [–] 17 points 2 years ago (2 children)

    For a long time, mine was dreamless. It wasn't until I turned off the TV before going to bed that I started to have dreams. I theorize that the external stimuli hindered my brain from creating dreams.

    It was a super weird period because my dreams started as nightmares, like my brain didn't know what the hell was going on. Then I drifted through a period of recurring dreams and then lucid dreams. They've settled down into more normal dreams, but I'm still super excited to dream each and every night. It feels like I found music after being deaf or seeing colors for the first time after being blind.

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  • [–] 18 points 2 years ago (3 children)

    It wasn't dreamless, you just weren't remembering your dreams. If your sleep was truly dreamless for a lengthy period of time you'd be dead.

    Often simply changing your sleeping habits in any significant way is enough to get you to start remembering dreams. That's because you need to wake up "unexpectedly" in the middle of a REM sleep phase to have a chance to form memories of them. Normally your brain has its memory-forming mechanism disengaged during REM sleep because there's no good reason to remember that stuff - it's just a side effect of a mental housekeeping routine.

    You can also "train" yourself to remember dreams more often, to some degree, by trying to record a dream journal or otherwise forcing your brain to lay down some memories of those dreams the moment you wake up and they're still present in your short-term memory.

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    [–] 30 points 2 years ago

    Your brain is still very much active. It's more like running a computer with the display turned off.

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  • [–] 28 points 2 years ago (1 child)

    Wonder how the robot feels about rebooting.

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  • [–] 23 points 2 years ago (5 children)

    It's pretty terrifying when you think about it, yet completely normalized.

    My pet peeve regarding all these discussions is that we throw around "consciousness", but we have no good definition for it ...

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  • [–] 35 points 2 years ago (3 children)

    I mean to be honest I wouldn’t say that we “die” at all when you sleep… your mind is extremely active while sleeping, it’s just disconnected from motor control.

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  • [–] 19 points 2 years ago (1 child)

    it’s just disconnected from motor control.

    It's way more than just that, though. You're also disconnected from your sensory inputs, and furthermore, your conscious experience is interrupted. It's not like you're just in a sensory deprivation tank, because there you'd still experience conscious thought, and the passage of time. It just seems to turn off for a while.

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  • [–] 12 points 2 years ago

    Plus there are periods of deep sleep when your brain does shut down quite thoroughly. People just don't remember those, obviously, so they put a lot more weight on the dreaming bits that slip through sometimes.

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  • [–] 14 points 2 years ago

    It's terrifying at first, but if you reflect over it further it becomes natural. Sure, we can't guarantee that we are the same continuous individual, but "not sleeping" would only see us have a more profound and permanent discontinuity. It's not a possibility for us. Still, we do carry something of the people we used to be regardless. Consciousness vanishes and recreates itself, as do most of our cells. We are evolving entities, as is everyone around us.

    This existential fear is rooted on a desire for permanence that we never had to begin with. There was never a fixed self that we could possibly know.

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    [–] 16 points 2 years ago* (4 children)

    A human being is a process of computation. Ending the computation is death. Pausing the computation is, well, simply pausing the computation. It has no profound significance.

    (This is also my answer to the "teleporter problem." As long as the computation continues, a change in the substrate on which it takes place also has no profound significance.)

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  • [–] 16 points 2 years ago (2 children)

    And if the teleportation process doesn't terminate the original, but creates a copy on the other end, are they both the same person?

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  • [–] 6 points 2 years ago* (5 children)

    Creating and destroying perfectly identical copies of the information that corresponds to a person neither creates nor destroys people unless the very last copy of that information is destroyed, in which case the person is killed.

    Small divergences aren't a big deal. For example, if a person spends an hour under the effect of an anesthetic (or alcohol) which prevents the formation of new long-term memories, this person isn't dying when he goes to sleep and wakes up without any memories of that last hour.

    Larger divergences are a big deal - losing a year of memories is pretty bad, losing a decade is even worse, and having one's mind returned to the blank slate of an infant is very close to the same thing as dying.

    So what I'm saying is that the two copies start out as the same person and then gradually become different people.

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    [–] 12 points 2 years ago*

    what a suspicious comic

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  • [–] 12 points 2 years ago

    Death is 'Long Death', Sleep is 'Short Death', and Naps are 'Power Death'.

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  • [–] 10 points 2 years ago (1 child)

    To die

    To sleep

    To sleep, perchance to dream...

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    [–] 7 points 2 years ago (12 children)

    I mean, I lucid dream every night. So my consciousness is rarely off.

    I've been practicing for almost 20 years to be able to switch it on and off so its kinda nice that I get to be a god 6 to 8 hours a day

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