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How exactly do we manage to fall asleep?

Asked by nebule (16446points) July 2nd, 2009

I’d like a scientific perspective if possible? Like ..is it simply a gradual relaxation of ,muscles and nerves to the point where the consciousness switches off? Or….not and something completely different…

Also: (might be a separate question but…) what’s the difference between sleeping and being under general anaesthetic?

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