I wouldn't put it down simply to confidence. He seemed confident before. He's just realising his potential and playing week in week out and has become one of our key players despite his inconsistent crossing.
I think tonight he will set the stage alight. Nani seems to love these CL games. Had we not conceded that Robben goal, Nani would have been the reason why we would have gone through, he was frightening that night. Seems to have been forgotten due to Rafael's red card.