On Friday night he fell asleep on the couch while watching TV. He looked so comfortable the family put a blanket over him and left him there.
He slept all day Saturday, barely moving. They left him alone.
And Sunday morning.
It wasn't until early Sunday afternoon that somebody thought, "Hey, Gramps hasn't woken up in over 40 hours. Maybe we should try to wake him".
Not surprisingly, they discovered they couldn't wake him up, and called 911.
So that's today's medical advice: It is NOT normal to sleep for almost 48 continuous hours.