told ya he had hearth attack,after his wife beat him....Maybe he had to go to work.
Even more likely, he is a practising Buddhist and used the opportunity to demonstrate restraint and that the pursuit of wealth isn't as important as we think.
same thing happened to me,only in freerolldonkfest,one that starts at 3pm cet i was 4th in it when break started,i fall asleep and see in morning i finished 124th placeI once fell asleep while deep in the Big $2.20. I was playing on the android while laying on the couch. When I woke up I was blinded out and very frustrated!
So falling asleep is a possibility although with that kind of money at stake one would probably find a way to stay up till the end.