“Obstructive Sleep Apnea (OSA) occurs when your airway temporarily collapses during sleep. You continue to make efforts to breath but are unable to move air in and out of your lungs because of the obstruction at the back of your throat.  During the collapse, which can last from 10 seconds to over a minute your breathing muscles continue to work with a progressive effort until you awaken and resume normal breathing. After a few breaths, your oxygen levels return to normal.  You fall back to sleep and the airway obstruction occurs again.  This cycle may continue throughout the night, disrupting your normal sleep pattern.  As a result, you may complain of un-refreshing sleep and excessive daytime sleepiness.