Obstructive sleep apnea (OSA) is a life-threatening sleep disorder.Simply put, if you’re suffering from sleep apnea, you repeatedlystop breathing while you sleep. - download at 4shared. Obstructive sleep apnea (OSA) is a life-threatening sleep disorder.Simply put, if you’re suffering from sleep apnea, you repeatedlystop breathing while you sleep. is hosted at free file sharing service 4shared.