According to this article "he doesn't remember how he fell". The article says he was in the water for 5 hours but that he fell overboard around 6 am and was spotted around 7:30 am - so something doesn't jive.
Disney Cruise Rescues Man Hours After He Fell From Royal Caribbean Ship Off Mexico | KTLA
Disney Cruise Rescues Man Hours After He Fell From Royal Caribbean Ship Off Mexico | KTLA