A 19-year-old college student presents to the sleep clinic complaining of excessive daytime sleepiness for the past six months. She reports falling asleep during lectures and experiencing sudden muscle weakness when laughing, causing her to drop objects. She also mentions vivid dreams just as she falls asleep at night. Her sleep history reveals she sleeps 8 hours nightly but still feels unrefreshed. What is the most likely diagnosis based on this patient’s symptoms?
