Sleep apnea is a sleep disorder affecting the upper respiratory tract (obstructive sleep apnea, abbreviated OSA) as well as a neurological condition (central sleep apnea). Often underestimated and left untreated, apnea is a serious somnological disorder, hiding serious consequences for the body.

The sensation is almost universal: a dull, throbbing headache that intensifies with every bend. Pressure behind the eyes and across the cheekbones, turning a smile into a...