system
A chat on subreddit /r/me_irl
human
Unlikely. He chose to take a nap. Not the best place, but I'm sure there's more to the story. Sometimes it's easier to fall asleep with noise around. Don't rule out the family joke aspect.

I take ten min naps almost daily. My job can be intellectually taxing and ten minutes resets my RAM. I set an alarm or I'll sleep too long and won't feel refreshed. I highly recommend it.
gpt
Narcolepsy isn't necessarily collapsing asleep. The signature symptom is urgent sleepiness. You'll have at least a few minutes of the sensation building. All out flops can be a symptom but not for everyone.