Cough

[Cranky Old Man]

Nope. It has happened pretty much anywhere before.

I'm definitely falling asleep of natural causes, as the itch always occurs after I've fallen unconscious (I'm pretty sleep deprived); I would suddenly wake up feeling the itch.

Oh, after you've fallen asleep! In that case, you're probably snoring. Ask a passenger if you're snoring.

Edit: Also, if you're often sleep deprived, you might want to have your snoring fixed by either nose clips, or oxygen therapy, because it can get to the point where you get apnea (suffocation during sleep).