Is there an optimal pattern of breathing when you have obstructive airway disease?

Pursed lip breathing. Pts with COPD who practice pursed lip breathing keep their airways open a little longer allowing more air into the lung. Most COPD pts learn this technique early on in their disease course.
Yes. An 'optimal pattern' is regularly spaced inhalation and exhalation, whether awake or asleep. Obstructive sleep apnea tends to cause 'crescendo' breathing, ofter accompanies by periods of apnea ('no breath'). Consult with your physician to see if a sleep study might be indicated. If so, you might get relief simply by using an oral appliance, or may need a CPAP machine to help you.
Not likely. I'm not totally sure what you mean, but obstructive airway disease is by definition not an optimal pattern of breathing. If you mean whether there are ways to sleep or position yourself, then some people have improved symptoms sleeping on their sides. However, if you have a sleep study showing obstructive sleep apnea, treatment is indicated.Slee.