Lots of BS and journalistic sensationalism . 10 min loss of Comm in a comm transfer is 99% of the time a wrong frequency set , more frequently so now with 8,33 to which the US crew are not yet that familiar with .
Nothing to do with sleeping ...:*

southeastern Tirana (Albania) at 7.10pm local time on Thursday without identifying itself and pilots did not respond to repeated calls by controllers from Italy and Greece for at least an hour, an official said on Sunday, confirming Greek media reports.
Following military protocol, at 7.49pm two F-16 fighter jets intercepted the Delta plane while it was flying near the Aegean island of Santorini.

That is a long time to be silent on ATC when crossing many FIR's. Bells ringing? It would to an EU pilot.

A Delta Airlines spokesman said: "While transiting to Greek airspace, the flight crew of Delta flight 8957, a charter operation from Hahn, Germany to Kuwait, was unable to establish radio communications with Greek air traffic control for a short period.
"This occurred during a handoff between air traffic control agencies and communications were expeditiously reestablished.

This sounds like great spin compared to what is reported by other sources. It diverts some blame to ATC and converts 1hr into expeditiously. Ho-Hum.

To those being the 'fatigue' drum we need to know the previous roster. A 17.00 departure and sleeping 2 hrs later in unfamiliar territory does not sound plausible to me. However, I'm sure the Delta guys enjoyed F16's rather than Migs.

You are assuming the press report is accurate. 98 times out of 100 they are not.

I thought that was what the dog was for.

Please, pilots never sleep in the cockpit, its forbidden! Now for little controlled nap...

If you're not aware of the airspace you're in, you're doing it wrong.