Mouth Breathing Rats
In this study, one group of young, growing rats were allowed to breathe normally while the other group of rats had one side of their nasal cavity surgically closed. The group of rats who breathed through their mouths took longer to accomplish various tasks and grew fewer critical brain cells than their counterparts. Mouth breathing negatively influenced the growth and development of the central nervous system.
SHUT UP and sleep: Be the lion, not the mouse. Roar, not squeak.