Narcolepsy is a chronic, lifelong neurologic disorder. The most common symptom is excessive sleepiness during the day. Narcolepsy involves a problem in the brain’s signals. As a result, you may fall asleep when you should be awake during the day.
Parasomnias are unwanted physical events or experiences that happen while falling asleep, sleeping, or waking up.
Obstructive sleep apnea (OSA) affects at least 25 million adults in the U.S. It is caused by the collapse of the airway in the back of the nose, mouth and throat during sleep.