Hypoventilation syndrome is a condition characterized by inadequate ventilation, leading to an increase in carbon dioxide levels in the blood. This can result from various factors, including obesity, neuromuscular disorders, or central nervous system issues. Symptoms may include daytime sleepiness, fatigue, and difficulty concentrating. The condition can lead to serious complications, such as respiratory failure or heart problems, if left untreated. Diagnosis typically involves sleep studies and blood tests to measure carbon dioxide levels. Treatment options may include lifestyle changes, oxygen therapy, or the use of devices to assist breathing during sleep, particularly in cases related to obstructive sleep apnea.