Joe Biden began to sleep in an air mask due to sleep apnea.
Herr Biden, 80, uses a CPAP device, a motorized medical device that prevents breathing interruptions during the night.
CPAP stands for "Continuous Positive Airway Pressure" (continuous positive respiratory pressure) and the device pumps air through a hose to a mask that is attached to the user on the nose.
The pressure of the air supplied keeps the airways open.
On both sides of Mr. Biden's face, horizontal notches of the mask tapes were visible when he left the White House on Wednesday to keep an economic speech in Chicago.
The deputy press spokesman Andrew Bates said that Mr. Biden has "disclosed his history with sleep apnea in detailed medical reports since 2008.
Mr. Bates said: "He used a CPAP device last night, which is common in people with this history."
sleep apnea is a common but possibly serious sleep disorder in which breathing can expose and start again.
untreated, symptoms such as forgetfulness, fatigue and drowsiness can occur.
According to studies, it can ultimately lead to cardiovascular diseases due to the considerable strain on the heart.
Age is one of several factors that increase the risk of developing a sleep apnea.
In humans with this disease, the neck and tongue muscles relax and block the airways while sleeping.
The risk increases through obesity, aging or facial structure.
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