Why do humans often sneeze twice?

Why isn't it possible for humans to sneeze while they're asleep?

  • Answer:

    Sneezing requires a reflex mechanism, wherein the sensory nerves in our upper respiratory tract, esp nostrils, are stimulated by some stimuli (mechanical or chemical or other)and these nerves then go to the CNS (i.

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Sneezing requires a reflex mechanism, wherein the sensory nerves in our upper respiratory tract, esp nostrils, are stimulated by some stimuli (mechanical or chemical or other)and these nerves then to the CNS (i.e brain) !

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