It was also 4am where she was, which might have had something to do with it.

I didn't watch the Grammy's, as it's usually a complete sham anyway, more of a popularity contest than actual honoring of the year's best.  However, when I've seen other performances of Amy's, even when she's obviously out of her mind, I've been captivated.  She's somehow able to release her entire soul out through her voice.  I hope she can get her crap together and do a few more albums like her last one.