This is a combination of obstructive sleep apnea and central sleep apnea. The name Complex sleep apnea was derived in 2006 by a detailed study from the Mayo Clinic. It is detected in 5-15% of patients that undergo the first stage of testing for sleep apnea.
Patients with complex sleep apnea at first appear to have obstructive sleep apnea and stop breathing 20 to 30 times per hour each night. But unlike typical obstructive sleep apnea patients, Instead their sleep apnea assumed the characteristics of central sleep apnea--the patients made no effort to breathe during apneic episodes, as if their brains were issuing no breathe command to their lungs.
There are at this time no known factors that influence this type of sleep apnea and an effective treatment eludes experts at this time.