Not sure about the AF configuration, but he would be resting either in a crew rest compartment fitted in the cargo hold [1], or alternatively in a reserved seat in business class.

Either way, no alarms are audible outside the cockpit.

[1] - http://www.airliners.net/aviation-forums/general_aviation/re...

> Either way, no alarms are audible outside the cockpit.

They should wear a Bluetooth at all times.