Is the hectic schedule starting to take a toll on Justin?

Is it just me or is this interview a lot different from most? Justin doesn't seem to be into it at all. It appears to me that he is not totally there. I wonder if the hectic schedule of flying around the world in such a short time to promote his new album is starting to take a toll on him. I really don't like what I see here. 
So is he this way because he's tired or is it because he's tired of