There are three types of sleep apnea: central sleep apnea, complex sleep apnea, and obstructive sleep apnea. Obstructive sleep apnea is the most common form of sleep apnea caused by blockage of the airways. The blockage of the airways results in fragmented sleep as the brain partially awakens the sleeper to gasp for air. Fortunately, obstructive sleep apnea treatment can manage unpleasant sleep apnea symptoms.