Why did my rating jump 150 pts overnight?

I'm not sure if it's a glitch in the system, or something I don't understand about the rating system in general.  Last night I ended play with a rating around 1250, this morning when I started it was 1400.  Why is this? 

I've been doing the tactics trainer and chess mentor, both really great tools and worth the membership cost alone, and I've noticed my tactical vision and quality of games in general have improved, but I don't see how that ties in to a jump in rating like that.

Any ideas, or known reasons, for this?

Thanks

I have the same question I think it is an error?  I think it is using chess mentor rating for live rating?

The answer is in another post, there was a rating adjustment for everyone...

see the "Chess rating suddenly increased" post for the official answer

http://www.chess.com/forum/view/livechess/standard-ratings-boost?page=1