Alexa Ranking

I am confused now.I dont know what's up with Alexa but before I left for work earlier my ranking was still in 1,700,000++ and after checking tonight its now in rank 9.I don't get it.I mean this is too good to be true and I personally dont think that my blog is doing that great.Lol.Anyway,i'll just check it again tomorrow and see if its still the same.