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According to

Consciouness

Consciousness is the state or quality of awareness or of being aware of an external object or something within oneself.

I suppose dreaming qualifies as "being aware of an external object or something within oneself". But what about sleeping without dreaming. Is there supposedly consciousness in that state?

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According to Giulio Tononi,"consciousness is what goes away when you fall into a dreamless sleep,” he explained that "once a person goes into dreamless sleep, there is no experience, no perception of surroundings or the environment; there are no memories of the past or the future or even the present. It is thus at this point that everything disappears, which corresponds to consciousness “going away.”" [1] You can look up his integrated information theory of consciousness [2]

  1. Tononi G, Edelman GM: Consciousness and complexity. Science. 1998, 282 (5395): 1846-1851. 10.1126/science.282.5395.1846.
  2. Tononi, G. (2011). The integrated information theory of consciousness: an updated account. Archives italiennes de biologie, 150(2/3), 56-90.
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