I would think it would be impossible to nod off while approaching a 7000' runway at night in a widebody, no ILS, hilly terrain, etc....
Dozed off doesn't sound good, but it happens, all the time, to responsible drivers on the road, so it could happen to a responsible pilot in the air. Of course, he may not have dozed off. The pilot flying might just started to wake his colleague as he lined up the plane, but had a heart attack, stroke, seizure, or some other incapacitating health issue.