Daily CPAP usage, long-term. Graphical representation of continuous positive airway pressure therapy usage by patients with sleep apnea displayed in average hours per day. Information was derived from long-term data, as determined in regular medical examination reports from every 12 months. Patients diagnosed with problems with initiating and/or maintaining sleep (IAP) prior to obstructive sleep apnea diagnosis used CPAP ventilator notably more hours per day. Although patients in both groups could be categorized as compliant (median of daily use was over 4.0 hours per day for patients in both groups).