New research suggests that treating obstructive sleep apnea, a common cause of snoring and daytime sleepiness, might also cut down on a serious health hazard associated with the condition -- the risk of developing high blood pressure. Researchers in Spain examined the number of new cases of high blood pressure in two groups with sleep apnea who used continuous positive airway pressure therapy, or CPAP, for either about four or 11 years. CPAP involves the use of a mask to help push air into the lungs while asleep.