I actually studied how if everyone took three deep intentional breaths everyday, their health would be drastically improved. Those stats startle me. It’s not the “inhale” so much as the “exhale”, to adequately empty our lungs of old air and allow in an abundance of the fresh. Makes sense. So I’ve also observed, for those who like bundled through the night, the benefit wearing a night shirt to cover the neck and shoulders from the night draft. It’s tough to get good oxygen when you’ve blocked your air passages with layers of goose down and, after you fall asleep, what’s to alert you to waken for full oxygen intake as long as you are getting “enough”. Definitely a case for “enough is not good enough”.