The f/o must be one gungho fly by the seat of the pants ace with lightning quick reflexes, superb at hands on manual flying! In his mind, do not trust those electronic gizmo like TCAS, EPGWS...they are always giving false indications. Can blame him as he was probably still in dreamland and may still be in dreamland even when fully awake.
In my experience, if one wants to take a " controlled " nap, I always make sure the seat is retracted full back and reclined back with the pilot fully strapped with seat belt and shoulder harness so that he/she does not accidently interfered with the controls in case of sudden reaction to nightmares or agitation. I had one guy who woked up suddenly with a jerk, kicking the rudder and his hands flailing across to the thrust levers!