This doesn't sound like Narcolepsy? A narcolepic person will suddenly fall asleep during a conversation, and 5-10 minutes later wake up and continue talking as

This doesn't sound like Narcolepsy? A narcolepic person will suddenly fall asleep during a conversation, and 5-10 minutes later wake up and continue talking as if nothing happened. I was giving a ride to somebody in NYC once from Florida and getting directions was difficult. Several times I had to drive around the block for 20 minutes or so, and she would wake up angry that we were going to wrong way. Eventually we got her home and she got her medication (modifinil).