Aug 28, 2022: Olga Askinazi, PhD, Edited By Roman Gokhman. Medically Reviewed By Nick Villalobos, MD Health Line Narcolepsy is a condition that causes you to feel overly drowsy when you’re awake. It also can result in sudden sleep attacks (loss of consciousness) during the day and fragmented sleep at night. Narcolepsy is a neurological disorder: […]