Hi,
Whenever I breathe through my nose, I feel very different.
When I breathe through my nose, I feel much more alert immediately than when I breathe through my mouth.
I know that breathing through nose increases the oxygen level in the blood and that it can contribute to the feeling of being more alert.
In contrary, when I breathe through my mouth, I feel very dumb and numb.
However, I doubt that it is really only because of the increased level of oxygen that is making me more alert.
So I am really curious. Is there any other factor in the nasal airway that may contribute to the health of our brain?