I went undiagnosed for about 15 years, until I finally saw a sleep specialist and she nailed the diagnosis right away. The vast majority of doctors have absolutely no idea
what it is or
what it looks like, and no routine lab tests, MRI, CT scan, x-ray or anything of that nature will detect it. 75% of people with narcolepsy never get diagnosed in their lifetime.
It doesn't look the way you think it looks. Common misdiagnoses in adults are depression, epilepsy, and migraines.