The condition is called Hypercapnia:
it is a condition where there is too much carbon dioxide (CO2) in the blood. Carbon dioxide is a gaseous product of the body's metabolism and is normally expelled through the lungs.
Sometimes when you have untreated OSA it can be compared to holding your breath under water in a swimming pool. Since you are not breathing normally, you can build up too much CO2, same can happen during sleep during apnea events.
Symptoms of early hypercapnia, where arterial carbon dioxide pressure, PaCO2, is elevated but not extremely so, include flushed skin, full pulse, extra-systoles, muscle twitches, hand flaps, and possibly a raised blood pressure. In severe hypercapnia (generally PaCO2 greater than 10kPa or 75mmHg), symptomatology progresses to disorientation, panic, hyperventilation, convulsions, unconsciousness, and eventually death.
The opposite condition is called hypocapnia.
someday science will catch up to what I'm saying...