secretly taping/viewing the mile high club in action.

sleeping

Um ... naked stewardesses? : D

Only one reason. The pilots fell asleep.

Two possibilities present themselves: 1.) Faulty navigation equipment 2.) Naughty stewardesses doing lap-dances. ;D

I have thousands of hours doing such a job, so have just a bit more insight than most here. I would say one probably did fall asleep, and the other wasn't paying attention for a brief period. They were foolish to not use falling asleep as an excuse. It is not at all uncommon for air carriers to be out of radio contact for brief periods. I have many times assisted ATC in trying to contact other airliners who "missed the switch". Traveling eight miles a minute, it doesn't take long for distance to add up. If they missed the ATC switch (VHF communication is line of sight limited), and either fell asleep briefly, or just weren't paying attention, it's not surprising such a thing could happen. Considering how many crew members I have flown with who slept for part of the flight, I'm surprised it doesn't happen more often. Personally, I was never comfortable sleeping in the cockpit, and would always be the one to stay awake (three pilot crew). Adequate rest costs the airline money. If a fatigue related issue happens, it ends up being the crews fault for not calling in fatigued (and delaying the flight / getting called into the office). Many crew members don't feel calling fatigue is worth the hassle they will receive from management.