Question

Why don't we sneeze when we are asleep ?

Answer 1

We actually should be more prone to sneezing during our sleep, as the mucous membranes swell when we lie down. This makes them more sensitive, but there usually isn't as much airflow or movement to stir up irritating particles, so they aren't as exposed to stimulants.

Answer 2

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During REM sleep (the phase where dreams take place), your muscles are paralysed so that you don't thrash around and hurt yourself.

This paralysis extends to reflex muscle contractions, so you can't sneeze while you are dreaming.

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Hope it helps... ¯\_(ツ)_/¯