Breathe Through Your Nose, Not Your Mouth

Mouth breathing during sleep and exercise dries out your throat, disrupts oxygen exchange, and can even affect facial development in children over years. Nasal breathing filters, warms, and humidifies air before it reaches your lungs, and it activates a calmer nervous system response than fast mouth breathing.

Practice keeping your mouth closed and breathing through your nose during light exercise and while falling asleep. If you wake up with a dry mouth most mornings, that's worth mentioning to a doctor.