Narcolepsy is often described as a disorder of excessive daytime sleepiness, but that description only tells part of the story. Many people living with narcolepsy also struggle with fragmented, restless, and unrefreshing sleep at night; and these symptoms that can look a lot like insomnia. In recent years, researchers have increasingly viewed narcolepsy as a disorder of sleep-wake instability, where the boundaries between wakefulness, non-REM sleep, and REM sleep become less secure. Understanding narcolepsy through this lens helps explain why someone can be profoundly sleepy during the day and still feel like they "can't sleep" at night. In this episode we will:
Explore why disrupted nighttime sleep is considered a core symptom of narcolepsy, not merely a side effect
Discuss the role of orexin (hypocretin) in stabilizing sleep and wake states and what happens when that system fails
Examine the surprising overlap between narcolepsy and insomnia symptoms, including frequent awakenings, vivid dreaming, and nonrestorative sleep
Review key research supporting the concept of sleep-state instability as a unifying explanation for many narcolepsy symptoms
Consider how treatments aimed at improving nighttime sleep consolidation may help patients feel more alert and functional during the day
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