"We found that the babies who died of SIDS had abnormalities in serotonin in regions of the brain stem that control breathing and heart rate and blood pressure during sleep."
VOA: standard.2010.02.08
Disciplines like yoga, tai chi, and even stretching exercises all require the consciousness and controlof our breathing in conjunction with moving our bodies.
He enriched the oxygen or the carbon dioxide in the air breathed by experimental subjects and found not a hint of suppression or exacerbation of yawning compared with control subjects breathing normal air.