Final answer:
Nighttime awakening is not typically seen in narcolepsy, which is characterized by features such as excessive daytime sleepiness, cataplexy, sleep paralysis, and hypnagogic hallucinations.
Step-by-step explanation:
The symptom not seen in narcolepsy is B. Nighttime awakening. Narcolepsy is characterized primarily by Excessive daytime sleepiness, Cataplexy (a sudden, partial or complete loss of muscle tone triggered by strong emotions), Sleep paralysis, and Hypnagogic hallucinations (vivid, dream-like experiences that occur while falling asleep).
Narcolepsy involves an irresistible urge to sleep and can include symptoms that mirror aspects of REM sleep, such as cataplexy and hallucinations. However, the involuntary awakenings during the night, generally associated with other sleep disorders such as insomnia or sleep apnea, are not a typical feature of narcolepsy. The feature that is typically not seen in narcolepsy is B. Nighttime awakening. People with narcolepsy often experience disrupted nighttime sleep, but the key characteristic is excessive daytime sleepiness rather than nighttime awakening. The other options—cataplexy, excessive daytime sleepiness, sleep paralysis, and hypnagogic hallucinations—are commonly associated with narcolepsy.