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why do we only breathe out of one nostril at a time?

Issue
If you put your hand under your nose you will find that every 20 mins we change nostril and breath out of the other. Why??

Best Tip

Because the brain cycles between hemispheres every 90 minutes or so, one becoming dominant over the other, when you breathe through your right nostril the left side of the brain is active and vice versa, it is believed that if you block one nostril you can engage the other hemisphere, logical hemisphere = right nostril (left hemisphere active), and creative hemisphere = left nostril (right hemisphere active).

The same can be said for lying on your side to go to sleep, lying on your left side will stimulate the right hemisphere so creating abstract and creative 'dreamlike' thoughts, and in doing so promote natural sleep conditions.

This is not a new concept and is the basis for very unique, positive learning systems, based on brain wave activity, and the use of certain types of music, usually classical. Source(s): http://www.lucidexperience.com/hypnopape... (one source, reference can be found about 1/4 way down first page)

Or take your pic: http://www.google.co.uk/search?hl=en&q=c...

Others
Maybe YOU do.....but I breathe out of both nostrils all the time.
We don't.
I have never paid enough attention until you mentioned it but maybe something w/ the blood flow and lungs mass or maybe its just you
You might, I don't.
Maybe there is a tiny little man up there who controls the nostrils and the brain is too cheap to hire another.