I saw something on a “crazy facts” show on TV once that answered this, they said that the body can sense via something in your armpit that you are lying on your side and it will clear your nostril so that you don’t suffocate in your sleep. You could replicate this by taking a squash ball or tennis ball and squeezing it in your armpit and the opposite nostril would clear.
I remember trying it, and it kinda working.
Now I’m older, and having read some answers here, I’m thinking that TV show was winding me the fuck up!
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