That last sentence there, ironhands, is interesting.
I was born with 'severe hyperinsulinemia hypoglycemia' and was having intense seizures from 2 months old till around 4 months old. It took my parents rushing me up to Mayo Clinic in Rochester, MN (a 16 hour drive then and now a 10 hour drive), to have it figured out; doctors around here just said "your son is perfectly normal besides the epileptic seizures..."
There was an overgrowth of the islets on the Pancreas, causing way too much growth of insulin, so a 'pancreatectomy' (90-95% + of pancreas removed) was done, around 4 months old (I have a massive belly scar).
For 5 years after, my parents checked my blood sugar levels daily, and I took the opposite of insulin, in 'Diazoxine' (med) form.
¿Could Narcolepsy relate directly [¿somehow?] to the pancreas and the islets; be it endocrine system?
No one, besides my parents in hindsight now (as of the last couple years, with understanding of Cataplexy, which I discovered the name of at 28 searching 'laughter AND paralysis), noted that when I was tickled as an infant, I would stop reacting and just stare off blankly. Very much, from my childhood, I can recall whenever I was tickled (intensely) in the belly, my arms would not respond and were limp; I mentioned it often, but it was never considered something unusual. It was around 20 when I began actually collapsing, from Cataplexy. That's all just to say, I've had Narcolepsy with Cataplexy since infancy...
And, I can definitely relate to wanting to binge eat, late evening and/or night, regardless of how much I've eaten earlier in the day...