1. Excessive Daytime Sleepiness (EDS): Persistent sleepiness regardless of how much sleep the individual gets during the night. 2. Cataplexy: Sudden, temporary loss of muscle tone often triggered by strong emotions such as laughter or anger. 3. Sleep Paralysis: Temporary inability to move or speak while falling asleep or waking up. 4. Hallucinations: Vivid and often frightening visual or auditory sensations that occur while falling asleep or upon waking.
