Nighttime Disorder is a term used to describe a variety of sleep-related issues, including Apnea. Apnea is a condition in which a person's breathing stops and starts during sleep, leading to poor quality sleep and daytime fatigue. It can be caused by a variety of factors, including obesity, smoking, and alcohol consumption. Treatment for Apnea typically involves lifestyle changes, such as weight loss, quitting smoking, and avoiding alcohol, as well as the use of CPAP machines or other medical devices.