system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come we don't sneeze in our sleep?
gpt
Because many neurotransmitters in your brain goes numb during sleep, and the ones controlling sneezing are one of them. So, it requires MUCH stronger stimulation to activate them during sleep. If you really needed to sneeze (like something obstructing your airflow), you would still sneeze, just the normal stimuli ignored during that time.

Basically, the same reason you don't realize your hand falling asleep, an ant walking on your skin or you being cold. If it doesn't cross the threshold, its ignored.