I thought so also, particularly after all the stick he got from the crowd. Comedy moment: think he said "boring" twice when the Chair of Oz Tennis was doing her speech.
It was after 1 am, they had played over five hours and she was bloody rambling on so I wouldn't blame him. The first time in the open era of the Australian Open someone has come from two down to win the final. For his age, injuries and having half a year off it is by far the biggest win of his career. I'm not surprised he was so emotional and he probably doubted himself that he would win another slam.