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President Biden talks to reporters as he departs the White House on Wednesday. After reporters pointed out the marks on his face, the White House revealed the president used a CPAP machine, used by people who have sleep apnea, Tuesday night. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images

Jeffrey Reed, who experienced persistent sinus infections and two bouts of pneumonia while using a Philips CPAP machine, poses with the device Oct. 20 at his home in Marysville, Ohio. Jay LaPrete/AP hide caption

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Jay LaPrete/AP

The mouthpiece of a CPAP (continuous positive airway pressure) device delivers enough pressurized air to keep the breathing passage of someone who has obstructive sleep apnea open throughout the night. Dr P. Marazzi/Science Source hide caption

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Dr P. Marazzi/Science Source

A CPAP machine can treat obstructive sleep apnea, a disorder which causes people to temporarily stop breathing throughout the night. But the machines, which blow air into a person's airways, take some getting used to. Brandon Thibodeaux/ProPublica hide caption

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Brandon Thibodeaux/ProPublica

CPAP masks have become much more comfortable than in years past, doctors say. But most of the time, they're probably not the first thing to try for sleep apnea. hide caption

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