A dyssomnia characterized by sleep disruption due to abnormal respiratory events during sleep, resulting in excessive daytime sleepiness or insomnia. Types of abnormal breathing include apneas (episodes of breathing cessation), hypopneas (abnormally slow or shallow respiration), and hypoventilation (abnormal blood oxygen and carbon dioxide levels). Three forms of breathing-related sleep disorder have been described: obstructive sleep apnea, central sleep apnea, and central alveolar hypoventilation syndrome.