Treatment of obstructive sleep apnea (OSA) with continuous positive airway pressure (CPAP) may also lower blood pressure among hypertensive adults, according to researchers in Spain, who presented his findings at the American Thoracic Society's 2008 International Conference in Toronto.The study included 394 consecutive patients with high blood pressure and non-sleepy OSA - those with mild enough OSA that their daytime alertness was unaffected.