In the past, I recall this page having listed narcolepsy, but I find no mention of narcolepsy anywhere relevant on the FAA website anymore. Can anyone enlighten me as to whether I am just missing it somewhere, or if there is knowledge of this specifically having been changed? It would surprise me greatly if this were not a disqualifying condition, but I want to find official information on it.
In the FAA Guide For Medical Examiners there is only a single direct reference to narcolepsy
Under the Obstructive Sleep Apnea QA section it states
Does this process involve other sleep disorder conditions? (E.g. Period Limb Movement Disorder, narcolepsy, central sleep apnea, etc.)?
No. This process is for obstructive sleep apnea only. If it is clear that the airman suffers from a different sleep disorder, DEFER and submit any supporting documentation for FAA decision.
This would indicate that if you suffer from any sleep disorder conditions your medical should be DEFERed
Earlier in the document it states:
Medical conditions that chronically interfere with sleep are disqualifying regardless of whether a sleep aid is used or not. Examples may include primary sleep disorders (e.g., insomnia, sleep apnea) or psychological disorders (e.g., anxiety, depression). While sleep aids may be appropriate and effective for short term symptomatic relief, the primary concern should be the diagnosis, treatment, and resolution of the underlying condition before clearance for aviation duties.
Narcolepsy is a sleep disorder and would potentially fall under this definition and thus prevent your from getting clearance.
In these cases its usually best to get the advice of an FAA AME.