Sleeping in helicopters?
I know of a pilot and crewman who both slept in a Puma, in Belize in the early 1980s.
They were wakened from their peaceful slumber that evening by one of the regular passengers, a Women's Royal Vouluntary Service lady.
She shook the pilot's left arm and told him it was time to land as they had gone past the airport ....
We split that particularly long shift after that and used two crews as it wasn't the first time someone fell asleep on the way back.