Brian,
I do not know whether my story is the basis for yours but I was the ALM on a Herc where everyone fell asleep. Nothing to do with imbibing the night before but everything to do with the very long hours we we were putting in in the build up to GW1. I went off intercom (the co was the watchkeeping pilot) to do a scan check and some paperwork. When I got back to the flight deck everyone was asleep. Something prompted me to look a the instrument panel and the VSI was showing a very slight rate of climb. I shook the co awake and pointed to the VSI. That woke him up ! Normal service was very swiftly resumed.