That would suggest to me that they begin to think as they come out of deep-sleep mode. Obviously, you cannot remember "not-thinking" but the fact that they poorly remember very recent thoughts says to me that there weren't many very recent thoughts, perhaps only those that accompanied the transition from unconcious to fully conscious mode. That seems more likely to me than having deep-sleep thoughts which you immediately forget.
Not really - and in fact that's totally counter to the whole materialistic idea. Brains are very active during all stages of sleep and work as much in concert at night as they do during waking hours - if not moreso.
The argument that consciousness "goes away" during deep sleep or anaesthesia is an argument that consciousness is something other than electrochemical or electromagnetic brain activity.
Why
should consciousness go away during anaesthesia or deep sleep if consciousness is simply an epiphenomenon or emergent property of nerual activity (which continues in deep sleep and anaesthesia)? What theory explains that from a solely materialistic view of consciousness?
And what of the materialistic support for robot consciousness? How and why should we ever assume robots conscious rather than in a state of something akin to permanent anaesthesia or deep sleep?
For an interesting take on this there is the first paragraph and last five paragraphs of the following article:
http://www.general-anaesthesia.com/painless.html
The above link reminds me somewhat of Sir Roger Penrose's ideas about quantum gates and microtubules - maybe anaesthetics really do interfere with the connection of consciousness to the body. The fact of the matter is, quite frankly, that we don't know.
What we do have, clearly, is the ability to alter
something about consciousness
somehow either by temporarily eliminating it entirely from the brian or wiping out memory of the time spent under anaesthesia (or a combination of both). Having a variable factor that we can manipulate is the beginning of a scientific investigation but we have no idea where it will lead us.
One thing is clear: the idea that brain activity produces consciousness and anaesthetic eliminates it are mutually exclusive. The hypothesis has to become further refined somehow.
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HypnoPsi