Sleep apnea—pauses in breathing while sleeping followed by snoring-like gasps for breath—can cause daytime drowsiness and mental fatigue. It can also boost blood pressure and the risk for developing heart disease. A new study suggests that treating sleep apnea by using a breathing machine during sleep can make a difference for people with hard-to-treat high blood pressure. Although blood pressure medications offer a bigger bang for the buck to reduce blood pressure, treating sleep apnea can help, and offers other benefits as well. Getting used to using a breathing machine, which delivers continuous positive airway pressure (CPAP), may take some work. One key is to find a mask that works, which may be a trial-and-error process.