He hasn't played particularly well for several years. Occasionally we have seen glimpses of his brilliant best but these games are few and far between. In my opinion he is on the verge of not being able to compete at the top level.
It's unfortunate the Carlsen didn't really mature until Anand was past his prime since that would have been an epic match!
Is he having nightmares of playing Carlsen?
Honestly he is not playing as good as he should be. Perhaps Anand is really facing some psychological distress after facing Carlsen.
I'd like to see the 6 time WCC put up a good fight in the Zurich chess challenge. Hopefully he comes in 3rd or 4th.