Clear-cut cataplexy coexisting with excessive daytime sleepiness points directly to the diagnosis of narcolepsy.The other 2 classic symptoms found in narcolepsy are sleep paralysis and hypnagogic hallucinations. In sleep paralysis, a patient becomes transiently unable to move before sleep onset or just after awakening. Hypnagogic and hypnopompic hallucinations are vivid, frightening dreams, often with a sensation of flying, that similarly occur at the time of transition from sleep into wakefulness or the reverse. ( Mayo Clinic)
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In sleep paralysis... most sleep-related hallucinations are visual and incorporate elements of the actual environment. For instance, individuals may describe objects appearing through cracks in the wall or describe objects moving in a picture on the wall. The hallucinations may also beauditory (e.g., hearing intruders in the home) or kinetic (e.g., sensation of flying ). ( American Psychiatric Association)
So what is the explanation for why people with narcolepsy often experience sensations of flying, particularly at the beginning or end of the episode?
Narcolepsy: New Understanding of Irresistible Sleep