No vote here because the answer is: It depends.
It depends on the time of day----I have a pronounced "nasal cycle" and at different times of the day it is quite clear I'm breathing out of different nostrils.
It also depends on just how bad the allergies are. Or whether I'm dealing with a super-duper head cold. In that case the "bottom" nostril is the one that immediately gets blocked when I'm sleeping on my side. So I turn over and the new "bottom" nostril immediately gets blocked as the new "top" nostril slowly clears.
I had symptoms like that, too, robysue. That was before endoscopic surgery back in the mid 1990's.
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Right now my right is clearer, though it changes.
My understanding is that the body alternates swelling the membranes left and right to clear them...the swelling forces mucus around and out, then opens up again.
But, in addition, when I lay on my right side I can breathe cleanly through both (or whatever one isn't in the cleaning cycle), but when I lay on my left, breathing is reduced in both. I have had my septum undeviated, and turbinate surgery, which helped, but this left side right side difference remains.
Before the turbinate surgery, I couldn't breathe out of either side though...