He would fall asleep at any given moment no matter what he was doind. In his case he was playing outside and just crashed into the ground into a sleep...
My sister has mild narcolepsy. She will be sitting there playin with her 2 kids and *BAM*.....she's out like a light. It has never happened when she is driving or at work. When she sits down at home, a family member's or a friends house she just...crashes. She wakes up after a few minutes, but its really weird. Especially when your in the next room talkin to get and all of a sudden she doesn't respond. Ya look back into the room and sure enough, she's sawin logs.